21969869309402 has 16 divisors (see below), whose sum is σ = 37662760867200. Its totient is φ = 9415626334128.

The previous prime is 21969869309393. The next prime is 21969869309429. The reversal of 21969869309402 is 20490396896912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1879724 + ... + 6890072.

It is an arithmetic number, because the mean of its divisors is an integer number (2353922554200).

Almost surely, 2^{21969869309402} is an apocalyptic number.

21969869309402 is a deficient number, since it is larger than the sum of its proper divisors (15692891557798).

21969869309402 is a wasteful number, since it uses less digits than its factorization.

21969869309402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323565.

The product of its (nonzero) digits is 90699264, while the sum is 68.

The spelling of 21969869309402 in words is "twenty-one trillion, nine hundred sixty-nine billion, eight hundred sixty-nine million, three hundred nine thousand, four hundred two".