21313722004 has 12 divisors (see below), whose sum is σ = 37300132800. Its totient is φ = 10656541208.

The previous prime is 21313721939. The next prime is 21313722011. The reversal of 21313722004 is 40022731312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21313722004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133077 + ... + 245635.

It is an arithmetic number, because the mean of its divisors is an integer number (3108344400).

Almost surely, 2^21313722004 is an apocalyptic number.

It is an amenable number.

21313722004 is a deficient number, since it is larger than the sum of its proper divisors (15986410796).

21313722004 is a wasteful number, since it uses less digits than its factorization.

21313722004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159902 (or 159900 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The spelling of 21313722004 in words is "twenty-one billion, three hundred thirteen million, seven hundred twenty-two thousand, four".