21074388 has 12 divisors (see below), whose sum is σ = 49173600. Its totient is φ = 7024792.

The previous prime is 21074359. The next prime is 21074393. The reversal of 21074388 is 88347012.

It is a tau number, because it is divible by the number of its divisors (12).

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, 878088 + ... + 878111.

It is an arithmetic number, because the mean of its divisors is an integer number (4097800).

Almost surely, 2^21074388 is an apocalyptic number.

It is an amenable number.

21074388 is an abundant number, since it is smaller than the sum of its proper divisors (28099212).

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

21074388 is a wasteful number, since it uses less digits than its factorization.

21074388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756206 (or 1756204 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21074388 is about 4590.6849162189. The cubic root of 21074388 is about 276.2177970010.

The spelling of 21074388 in words is "twenty-one million, seventy-four thousand, three hundred eighty-eight".