20331421331 has 16 divisors (see below), whose sum is σ = 22617584640. Its totient is φ = 18149283360.

The previous prime is 20331421307. The next prime is 20331421349. The reversal of 20331421331 is 13312413302.

It is not a de Polignac number, because 20331421331 - 2¹⁸ = 20331159187 is a prime.

It is a super-2 number, since 2×20331421331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331421297 and 20331421306.

It is not an unprimeable number, because it can be changed into a prime (20331421361) 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, 580640 + ... + 614658.

It is an arithmetic number, because the mean of its divisors is an integer number (1413599040).

Almost surely, 2^20331421331 is an apocalyptic number.

20331421331 is a deficient number, since it is larger than the sum of its proper divisors (2286163309).

20331421331 is a wasteful number, since it uses less digits than its factorization.

20331421331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35546.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 20331421331 its reverse (13312413302), we get a palindrome (33643834633).

The spelling of 20331421331 in words is "twenty billion, three hundred thirty-one million, four hundred twenty-one thousand, three hundred thirty-one".