21163339008 has 108 divisors (see below), whose sum is σ = 69736194528. Its totient is φ = 6046663680.

The previous prime is 21163339007. The next prime is 21163339009. The reversal of 21163339008 is 80093336112.

21163339008 is a `hidden beast` number, since 2 + 11 + 633 + 3 + 9 + 0 + 0 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21163339007) and next prime (21163339009).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163339007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639978 + ... + 672233.

Almost surely, 2^21163339008 is an apocalyptic number.

21163339008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21163339008 is an abundant number, since it is smaller than the sum of its proper divisors (48572855520).

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

21163339008 is a wasteful number, since it uses less digits than its factorization.

21163339008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312240 (or 1312223 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 21163339008 in words is "twenty-one billion, one hundred sixty-three million, three hundred thirty-nine thousand, eight".