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2021123421 = 34171467773
BaseRepresentation
bin111100001110111…
…1110010101011101
312012212002201010000
41320131332111131
513114401422141
6532315404513
7101041160052
oct17035762535
95185081100
102021123421
11947964a39
12484a53739
13262961c25
141525d7029
15bc6865b6
hex7877e55d

2021123421 has 20 divisors (see below), whose sum is σ = 3196811772. Its totient is φ = 1268155008.

The previous prime is 2021123393. The next prime is 2021123437. The reversal of 2021123421 is 1243211202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1588899321 + 432224100 = 39861^2 + 20790^2 .

It is not a de Polignac number, because 2021123421 - 211 = 2021121373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021123394 and 2021123403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021123441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 732510 + ... + 735263.

Almost surely, 22021123421 is an apocalyptic number.

It is an amenable number.

2021123421 is a deficient number, since it is larger than the sum of its proper divisors (1175688351).

2021123421 is a wasteful number, since it uses less digits than its factorization.

2021123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467802 (or 1467793 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2021123421 is about 44956.9062658898. The cubic root of 2021123421 is about 1264.3411653604.

Adding to 2021123421 its reverse (1243211202), we get a palindrome (3264334623).

The spelling of 2021123421 in words is "two billion, twenty-one million, one hundred twenty-three thousand, four hundred twenty-one".

Divisors: 1 3 9 17 27 51 81 153 459 1377 1467773 4403319 13209957 24952141 39629871 74856423 118889613 224569269 673707807 2021123421