21066496 has 36 divisors (see below), whose sum is σ = 45879624. Its totient is φ = 9574400.

The previous prime is 21066491. The next prime is 21066509. The reversal of 21066496 is 69466012.

It is not an unprimeable number, because it can be changed into a prime (21066491) 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, 925 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (1274434).

Almost surely, 2^21066496 is an apocalyptic number.

It is an amenable number.

21066496 is an abundant number, since it is smaller than the sum of its proper divisors (24813128).

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

21066496 is an equidigital number, since it uses as much as digits as its factorization.

21066496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7508 (or 7494 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 21066496 is about 4589.8252690053. The cubic root of 21066496 is about 276.1833130732.

The spelling of 21066496 in words is "twenty-one million, sixty-six thousand, four hundred ninety-six".