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21896861 = 7732587
BaseRepresentation
bin101001110000…
…1111010011101
31112012110211212
41103201322131
521101144421
62101154205
7354056150
oct123417235
945173755
1021896861
11113a6488
1273bb965
1346c892c
142c9dc97
151dc7e5b
hex14e1e9d

21896861 has 12 divisors (see below), whose sum is σ = 25415712. Its totient is φ = 18480096.

The previous prime is 21896857. The next prime is 21896863. The reversal of 21896861 is 16869812.

It is not a de Polignac number, because 21896861 - 22 = 21896857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21896863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37010 + ... + 37596.

It is an arithmetic number, because the mean of its divisors is an integer number (2117976).

Almost surely, 221896861 is an apocalyptic number.

It is an amenable number.

21896861 is a deficient number, since it is larger than the sum of its proper divisors (3518851).

21896861 is an frugal number, since it uses more digits than its factorization.

21896861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 667 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 21896861 is about 4679.4081890769. The cubic root of 21896861 is about 279.7653689177.

It can be divided in two parts, 218 and 96861, that added together give a palindrome (97079).

The spelling of 21896861 in words is "twenty-one million, eight hundred ninety-six thousand, eight hundred sixty-one".

Divisors: 1 7 73 511 587 4109 5329 37303 42851 299957 3128123 21896861