21110464 has 28 divisors (see below), whose sum is σ = 44357544. Its totient is φ = 9933824.

The previous prime is 21110443. The next prime is 21110489. The reversal of 21110464 is 46401112.

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, 8614 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (1584198).

Almost surely, 2^21110464 is an apocalyptic number.

It is an amenable number.

21110464 is an abundant number, since it is smaller than the sum of its proper divisors (23247080).

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

21110464 is a wasteful number, since it uses less digits than its factorization.

21110464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19432 (or 19422 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21110464 is about 4594.6124972624. The cubic root of 21110464 is about 276.3753207937.

Adding to 21110464 its reverse (46401112), we get a palindrome (67511576).

The spelling of 21110464 in words is "twenty-one million, one hundred ten thousand, four hundred sixty-four".