11521320031 has 8 divisors (see below), whose sum is σ = 12436369344. Its totient is φ = 10610384160.

The previous prime is 11521320017. The next prime is 11521320037. The reversal of 11521320031 is 13002312511.

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 11521320031 - 2²⁵ = 11487765599 is a prime.

It is a super-2 number, since 2×11521320031² (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 = 11521319990 and 11521320008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521320037) 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, 1022536 + ... + 1033741.

It is an arithmetic number, because the mean of its divisors is an integer number (1554546168).

Almost surely, 2^11521320031 is an apocalyptic number.

11521320031 is a deficient number, since it is larger than the sum of its proper divisors (915049313).

11521320031 is a wasteful number, since it uses less digits than its factorization.

11521320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056721.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 11521320031 its reverse (13002312511), we get a palindrome (24523632542).

The spelling of 11521320031 in words is "eleven billion, five hundred twenty-one million, three hundred twenty thousand, thirty-one".