21398504202 has 24 divisors (see below), whose sum is σ = 46376745636. Its totient is φ = 7130785536.

The previous prime is 21398504201. The next prime is 21398504213. The reversal of 21398504202 is 20240589312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15595264161 + 5803240041 = 124881^2 + 76179^2 .

It is not an unprimeable number, because it can be changed into a prime (21398504201) 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, 105703 + ... + 232314.

Almost surely, 2^21398504202 is an apocalyptic number.

21398504202 is an abundant number, since it is smaller than the sum of its proper divisors (24978241434).

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

21398504202 is a wasteful number, since it uses less digits than its factorization.

21398504202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341542 (or 341539 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21398504202 in words is "twenty-one billion, three hundred ninety-eight million, five hundred four thousand, two hundred two".