21077488 has 20 divisors (see below), whose sum is σ = 41245128. Its totient is φ = 10433600.

The previous prime is 21077477. The next prime is 21077527. The reversal of 21077488 is 88477012.

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, 4906 + ... + 8137.

Almost surely, 2^21077488 is an apocalyptic number.

It is an amenable number.

21077488 is a deficient number, since it is larger than the sum of its proper divisors (20167640).

21077488 is a wasteful number, since it uses less digits than its factorization.

21077488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13152 (or 13146 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 21077488 is about 4591.0225440527. The cubic root of 21077488 is about 276.2313400307.

The spelling of 21077488 in words is "twenty-one million, seventy-seven thousand, four hundred eighty-eight".