21054056 has 32 divisors (see below), whose sum is σ = 40538880. Its totient is φ = 10248000.

The previous prime is 21054049. The next prime is 21054067. The reversal of 21054056 is 65045012.

It is a super-2 number, since 2×21054056² = 886546548102272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57185 + ... + 57551.

It is an arithmetic number, because the mean of its divisors is an integer number (1266840).

Almost surely, 2^21054056 is an apocalyptic number.

It is an amenable number.

21054056 is a deficient number, since it is larger than the sum of its proper divisors (19484824).

21054056 is a wasteful number, since it uses less digits than its factorization.

21054056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21054056 is about 4588.4698974713. The cubic root of 21054056 is about 276.1289392638.

Adding to 21054056 its reverse (65045012), we get a palindrome (86099068).

The spelling of 21054056 in words is "twenty-one million, fifty-four thousand, fifty-six".