12021132431 has 32 divisors (see below), whose sum is σ = 15216768000. Its totient is φ = 9224167680.

The previous prime is 12021132379. The next prime is 12021132457. The reversal of 12021132431 is 13423112021.

It is not a de Polignac number, because 12021132431 - 2²² = 12016938127 is a prime.

It is a super-2 number, since 2×12021132431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021132481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4714745 + ... + 4717293.

It is an arithmetic number, because the mean of its divisors is an integer number (475524000).

Almost surely, 2^12021132431 is an apocalyptic number.

12021132431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12021132431 is a deficient number, since it is larger than the sum of its proper divisors (3195635569).

12021132431 is a wasteful number, since it uses less digits than its factorization.

12021132431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 12021132431 its reverse (13423112021), we get a palindrome (25444244452).

The spelling of 12021132431 in words is "twelve billion, twenty-one million, one hundred thirty-two thousand, four hundred thirty-one".