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21880242 = 2321215569
BaseRepresentation
bin101001101110…
…1110110110010
31112011122001100
41103131312302
521100131432
62100545230
7353656536
oct123356662
945148040
1021880242
1111394a4a
1273b2216
1346c11b7
142c97bc6
151dc307c
hex14dddb2

21880242 has 12 divisors (see below), whose sum is σ = 47407230. Its totient is φ = 7293408.

The previous prime is 21880231. The next prime is 21880247. The reversal of 21880242 is 24208812.

It can be written as a sum of positive squares in only one way, i.e., 21818241 + 62001 = 4671^2 + 249^2 .

It is not an unprimeable number, because it can be changed into a prime (21880247) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 607767 + ... + 607802.

Almost surely, 221880242 is an apocalyptic number.

21880242 is an abundant number, since it is smaller than the sum of its proper divisors (25526988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21880242 is a wasteful number, since it uses less digits than its factorization.

21880242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215577 (or 1215574 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21880242 is about 4677.6320932711. The cubic root of 21880242 is about 279.6945734216.

It can be divided in two parts, 21880 and 242, that added together give a palindrome (22122).

The spelling of 21880242 in words is "twenty-one million, eight hundred eighty thousand, two hundred forty-two".

Divisors: 1 2 3 6 9 18 1215569 2431138 3646707 7293414 10940121 21880242