20331421131 has 16 divisors (see below), whose sum is σ = 30988306944. Its totient is φ = 11615294784.

The previous prime is 20331421127. The next prime is 20331421147. The reversal of 20331421131 is 13112413302.

It is not a de Polignac number, because 20331421131 - 2² = 20331421127 is a prime.

It is a super-2 number, since 2×20331421131² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20331421098 and 20331421107.

It is not an unprimeable number, because it can be changed into a prime (20331421111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15015 + ... + 202208.

It is an arithmetic number, because the mean of its divisors is an integer number (1936769184).

Almost surely, 2^20331421131 is an apocalyptic number.

20331421131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20331421131 is a deficient number, since it is larger than the sum of its proper divisors (10656885813).

20331421131 is a wasteful number, since it uses less digits than its factorization.

20331421131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221690.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20331421131 its reverse (13112413302), we get a palindrome (33443834433).

The spelling of 20331421131 in words is "twenty billion, three hundred thirty-one million, four hundred twenty-one thousand, one hundred thirty-one".