21160777031 has 8 divisors (see below), whose sum is σ = 21535153920. Its totient is φ = 20788122168.

The previous prime is 21160777007. The next prime is 21160777049. The reversal of 21160777031 is 13077706112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21160777031 is a prime.

It is a super-2 number, since 2×21160777031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21160776982 and 21160777000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160777091) 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, 405701 + ... + 454878.

It is an arithmetic number, because the mean of its divisors is an integer number (2691894240).

Almost surely, 2^21160777031 is an apocalyptic number.

21160777031 is a deficient number, since it is larger than the sum of its proper divisors (374376889).

21160777031 is an equidigital number, since it uses as much as digits as its factorization.

21160777031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861013.

The product of its (nonzero) digits is 12348, while the sum is 35.

The spelling of 21160777031 in words is "twenty-one billion, one hundred sixty million, seven hundred seventy-seven thousand, thirty-one".