11312031021 has 8 divisors (see below), whose sum is σ = 15178776864. Its totient is φ = 7493319600.

The previous prime is 11312030897. The next prime is 11312031041. The reversal of 11312031021 is 12013021311.

It is a happy number.

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

It is not a de Polignac number, because 11312031021 - 2¹⁸ = 11311768877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312031041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12008055 + ... + 12008996.

It is an arithmetic number, because the mean of its divisors is an integer number (1897347108).

Almost surely, 2^11312031021 is an apocalyptic number.

It is an amenable number.

11312031021 is a deficient number, since it is larger than the sum of its proper divisors (3866745843).

11312031021 is a wasteful number, since it uses less digits than its factorization.

11312031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24017211.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11312031021 its reverse (12013021311), we get a palindrome (23325052332).

The spelling of 11312031021 in words is "eleven billion, three hundred twelve million, thirty-one thousand, twenty-one".