21233221131 has 16 divisors (see below), whose sum is σ = 29297986560. Its totient is φ = 13662327840.

The previous prime is 21233221123. The next prime is 21233221147. The reversal of 21233221131 is 13112233212.

It is not a de Polignac number, because 21233221131 - 2³ = 21233221123 is a prime.

It is a super-2 number, since 2×21233221131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233221098 and 21233221107.

It is not an unprimeable number, because it can be changed into a prime (21233221171) 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, 200326 + ... + 287396.

It is an arithmetic number, because the mean of its divisors is an integer number (1831124160).

Almost surely, 2^21233221131 is an apocalyptic number.

21233221131 is a deficient number, since it is larger than the sum of its proper divisors (8064765429).

21233221131 is a wasteful number, since it uses less digits than its factorization.

21233221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89906.

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

Adding to 21233221131 its reverse (13112233212), we get a palindrome (34345454343).

The spelling of 21233221131 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-one thousand, one hundred thirty-one".