21428608304 has 30 divisors (see below), whose sum is σ = 42505974756. Its totient is φ = 10465119840.

The previous prime is 21428608277. The next prime is 21428608319. The reversal of 21428608304 is 40380682412.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332582 + ... + 391749.

Almost surely, 2^21428608304 is an apocalyptic number.

It is an amenable number.

21428608304 is a deficient number, since it is larger than the sum of its proper divisors (21077366452).

21428608304 is an equidigital number, since it uses as much as digits as its factorization.

21428608304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724425 (or 724376 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 21428608304 in words is "twenty-one billion, four hundred twenty-eight million, six hundred eight thousand, three hundred four".