21385713802 has 16 divisors (see below), whose sum is σ = 33097559040. Its totient is φ = 10358302032.

The previous prime is 21385713793. The next prime is 21385713809. The reversal of 21385713802 is 20831758312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21385713809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1268538 + ... + 1285285.

It is an arithmetic number, because the mean of its divisors is an integer number (2068597440).

Almost surely, 2^21385713802 is an apocalyptic number.

21385713802 is a deficient number, since it is larger than the sum of its proper divisors (11711845238).

21385713802 is a wasteful number, since it uses less digits than its factorization.

21385713802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553957.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21385713802 in words is "twenty-one billion, three hundred eighty-five million, seven hundred thirteen thousand, eight hundred two".