21274156 has 24 divisors (see below), whose sum is σ = 38060064. Its totient is φ = 10402560.

The previous prime is 21274133. The next prime is 21274159. The reversal of 21274156 is 65147212.

It is not an unprimeable number, because it can be changed into a prime (21274159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48916 + ... + 49348.

It is an arithmetic number, because the mean of its divisors is an integer number (1585836).

Almost surely, 2^21274156 is an apocalyptic number.

It is an amenable number.

21274156 is a deficient number, since it is larger than the sum of its proper divisors (16785908).

21274156 is a wasteful number, since it uses less digits than its factorization.

21274156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 679 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 21274156 is about 4612.3915705413. The cubic root of 21274156 is about 277.0878268076.

The spelling of 21274156 in words is "twenty-one million, two hundred seventy-four thousand, one hundred fifty-six".