21143702608 has 20 divisors (see below), whose sum is σ = 46818198880. Its totient is φ = 9061586784.

The previous prime is 21143702561. The next prime is 21143702633. The reversal of 21143702608 is 80620734112.

It is a congruent number.

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, 94391418 + ... + 94391641.

It is an arithmetic number, because the mean of its divisors is an integer number (2340909944).

Almost surely, 2^21143702608 is an apocalyptic number.

21143702608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21143702608 is an abundant number, since it is smaller than the sum of its proper divisors (25674496272).

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

21143702608 is a wasteful number, since it uses less digits than its factorization.

21143702608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188783074 (or 188783068 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 21143702608 in words is "twenty-one billion, one hundred forty-three million, seven hundred two thousand, six hundred eight".