21074136 has 16 divisors (see below), whose sum is σ = 52685400. Its totient is φ = 7024704.

The previous prime is 21074129. The next prime is 21074147. The reversal of 21074136 is 63147012.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 878089 = 21074136 / (2 + 1 + 0 + 7 + 4 + 1 + 3 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439021 + ... + 439068.

Almost surely, 2^21074136 is an apocalyptic number.

It is an amenable number.

21074136 is an abundant number, since it is smaller than the sum of its proper divisors (31611264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21074136 is a wasteful number, since it uses less digits than its factorization.

21074136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878098 (or 878094 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21074136 is about 4590.6574692521. The cubic root of 21074136 is about 276.2166960254.

The spelling of 21074136 in words is "twenty-one million, seventy-four thousand, one hundred thirty-six".