21338809002 has 36 divisors (see below), whose sum is σ = 53782510626. Its totient is φ = 6096802320.

The previous prime is 21338808991. The next prime is 21338809021. The reversal of 21338809002 is 20090883312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18001320561 + 3337488441 = 134169^2 + 57771^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12095949 + ... + 12097712.

Almost surely, 2^21338809002 is an apocalyptic number.

21338809002 is an abundant number, since it is smaller than the sum of its proper divisors (32443701624).

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

21338809002 is a wasteful number, since it uses less digits than its factorization.

21338809002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24193683 (or 24193673 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21338809002 in words is "twenty-one billion, three hundred thirty-eight million, eight hundred nine thousand, two".