21120508 has 12 divisors (see below), whose sum is σ = 37028992. Its totient is φ = 10540800.

The previous prime is 21120503. The next prime is 21120523. The reversal of 21120508 is 80502112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2268 + ... + 6883.

Almost surely, 2^21120508 is an apocalyptic number.

It is an amenable number.

21120508 is a deficient number, since it is larger than the sum of its proper divisors (15908484).

21120508 is a wasteful number, since it uses less digits than its factorization.

21120508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9732 (or 9730 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 21120508 is about 4595.7053865538. The cubic root of 21120508 is about 276.4191454043.

The spelling of 21120508 in words is "twenty-one million, one hundred twenty thousand, five hundred eight".