20132431021 has 4 divisors (see below), whose sum is σ = 20387272000. Its totient is φ = 19877590044.

The previous prime is 20132431013. The next prime is 20132431031. The reversal of 20132431021 is 12013423102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12013423102 = 2 ⋅6006711551.

It is a cyclic number.

It is not a de Polignac number, because 20132431021 - 2³ = 20132431013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20132431021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20132431031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127420371 + ... + 127420528.

It is an arithmetic number, because the mean of its divisors is an integer number (5096818000).

Almost surely, 2^20132431021 is an apocalyptic number.

It is an amenable number.

20132431021 is a deficient number, since it is larger than the sum of its proper divisors (254840979).

20132431021 is an equidigital number, since it uses as much as digits as its factorization.

20132431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254840978.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20132431021 its reverse (12013423102), we get a palindrome (32145854123).

The spelling of 20132431021 in words is "twenty billion, one hundred thirty-two million, four hundred thirty-one thousand, twenty-one".