21499496 has 16 divisors (see below), whose sum is σ = 40914240. Its totient is φ = 10589040.

The previous prime is 21499483. The next prime is 21499501. The reversal of 21499496 is 69499412.

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, 19520 + ... + 20591.

It is an arithmetic number, because the mean of its divisors is an integer number (2557140).

Almost surely, 2^21499496 is an apocalyptic number.

It is an amenable number.

21499496 is a deficient number, since it is larger than the sum of its proper divisors (19414744).

21499496 is a wasteful number, since it uses less digits than its factorization.

21499496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40184 (or 40180 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 21499496 is about 4636.7548997117. The cubic root of 21499496 is about 278.0627155230.

It can be divided in two parts, 2 and 1499496, that multiplied together give a palindrome (2998992).

The spelling of 21499496 in words is "twenty-one million, four hundred ninety-nine thousand, four hundred ninety-six".