21342562008 has 64 divisors (see below), whose sum is σ = 57697090560. Its totient is φ = 6553238016.

The previous prime is 21342561949. The next prime is 21342562009. The reversal of 21342562008 is 80026524312.

It is a self number, because there is not a number n which added to its sum of digits gives 21342562008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342562009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537316 + ... + 575667.

It is an arithmetic number, because the mean of its divisors is an integer number (901517040).

Almost surely, 2^21342562008 is an apocalyptic number.

It is an amenable number.

21342562008 is an abundant number, since it is smaller than the sum of its proper divisors (36354528552).

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

21342562008 is a wasteful number, since it uses less digits than its factorization.

21342562008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113056 (or 1113052 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21342562008 in words is "twenty-one billion, three hundred forty-two million, five hundred sixty-two thousand, eight".