21394039902 has 8 divisors (see below), whose sum is σ = 42788079816. Its totient is φ = 7131346632.

The previous prime is 21394039897. The next prime is 21394039903. The reversal of 21394039902 is 20993049312.

It is a sphenic number, since it is the product of 3 distinct primes.

21394039902 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21394039903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1782836653 + ... + 1782836664.

It is an arithmetic number, because the mean of its divisors is an integer number (5348509977).

Almost surely, 2^21394039902 is an apocalyptic number.

21394039902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21394039902 is a wasteful number, since it uses less digits than its factorization.

21394039902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565673322.

The product of its (nonzero) digits is 104976, while the sum is 42.

The spelling of 21394039902 in words is "twenty-one billion, three hundred ninety-four million, thirty-nine thousand, nine hundred two".