20111232131 has 4 divisors (see below), whose sum is σ = 20985633552. Its totient is φ = 19236830712.

The previous prime is 20111232091. The next prime is 20111232149. The reversal of 20111232131 is 13123211102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13123211102 = 2 ⋅6561605551.

It is not a de Polignac number, because 20111232131 - 2¹⁸ = 20110969987 is a prime.

It is a super-2 number, since 2×20111232131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111232151) 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, 437200676 + ... + 437200721.

It is an arithmetic number, because the mean of its divisors is an integer number (5246408388).

Almost surely, 2^20111232131 is an apocalyptic number.

20111232131 is a deficient number, since it is larger than the sum of its proper divisors (874401421).

20111232131 is an equidigital number, since it uses as much as digits as its factorization.

20111232131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874401420.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20111232131 its reverse (13123211102), we get a palindrome (33234443233).

The spelling of 20111232131 in words is "twenty billion, one hundred eleven million, two hundred thirty-two thousand, one hundred thirty-one".