21574012 has 6 divisors (see below), whose sum is σ = 37754528. Its totient is φ = 10787004.

The previous prime is 21574009. The next prime is 21574013. The reversal of 21574012 is 21047512.

It is a happy number.

It is a super-2 number, since 2×21574012² = 930875987552288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21574013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2696748 + ... + 2696755.

Almost surely, 2^21574012 is an apocalyptic number.

It is an amenable number.

21574012 is a deficient number, since it is larger than the sum of its proper divisors (16180516).

21574012 is a wasteful number, since it uses less digits than its factorization.

21574012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393507 (or 5393505 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21574012 is about 4644.7833103386. The cubic root of 21574012 is about 278.3835948133.

The spelling of 21574012 in words is "twenty-one million, five hundred seventy-four thousand, twelve".