21309774331 has 8 divisors (see below), whose sum is σ = 21474779760. Its totient is φ = 21144936288.

The previous prime is 21309774281. The next prime is 21309774359. The reversal of 21309774331 is 13347790312.

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

It is a cyclic number.

It is not a de Polignac number, because 21309774331 - 2¹³ = 21309766139 is a prime.

It is a super-2 number, since 2×21309774331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21309774361) 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, 220065 + ... + 301741.

It is an arithmetic number, because the mean of its divisors is an integer number (2684347470).

Almost surely, 2^21309774331 is an apocalyptic number.

21309774331 is a deficient number, since it is larger than the sum of its proper divisors (165005429).

21309774331 is a wasteful number, since it uses less digits than its factorization.

21309774331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83693.

The product of its (nonzero) digits is 95256, while the sum is 40.

The spelling of 21309774331 in words is "twenty-one billion, three hundred nine million, seven hundred seventy-four thousand, three hundred thirty-one".