21274654 has 16 divisors (see below), whose sum is σ = 32822496. Its totient is φ = 10336000.

The previous prime is 21274651. The next prime is 21274679. The reversal of 21274654 is 45647212.

It is a super-2 number, since 2×21274654² = 905221805639432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32559 + ... + 33205.

It is an arithmetic number, because the mean of its divisors is an integer number (2051406).

Almost surely, 2^21274654 is an apocalyptic number.

21274654 is a deficient number, since it is larger than the sum of its proper divisors (11547842).

21274654 is a wasteful number, since it uses less digits than its factorization.

21274654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091.

The product of its digits is 13440, while the sum is 31.

The square root of 21274654 is about 4612.4455552342. The cubic root of 21274654 is about 277.0899888779.

The spelling of 21274654 in words is "twenty-one million, two hundred seventy-four thousand, six hundred fifty-four".