21313709155 has 8 divisors (see below), whose sum is σ = 26401497984. Its totient is φ = 16500936000.

The previous prime is 21313709147. The next prime is 21313709213. The reversal of 21313709155 is 55190731312.

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

It is not a de Polignac number, because 21313709155 - 2³ = 21313709147 is a prime.

It is a Duffinian number.

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, 68753746 + ... + 68754055.

It is an arithmetic number, because the mean of its divisors is an integer number (3300187248).

Almost surely, 2^21313709155 is an apocalyptic number.

21313709155 is a deficient number, since it is larger than the sum of its proper divisors (5087788829).

21313709155 is a wasteful number, since it uses less digits than its factorization.

21313709155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137507837.

The product of its (nonzero) digits is 28350, while the sum is 37.

The spelling of 21313709155 in words is "twenty-one billion, three hundred thirteen million, seven hundred nine thousand, one hundred fifty-five".