21230131182 has 48 divisors (see below), whose sum is σ = 48682289520. Its totient is φ = 6148087296.

The previous prime is 21230131127. The next prime is 21230131211. The reversal of 21230131182 is 28113103212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 598557 + ... + 633032.

It is an arithmetic number, because the mean of its divisors is an integer number (1014214365).

Almost surely, 2^21230131182 is an apocalyptic number.

21230131182 is an abundant number, since it is smaller than the sum of its proper divisors (27452158338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230131182 is a wasteful number, since it uses less digits than its factorization.

21230131182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231637 (or 1231624 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 21230131182 its reverse (28113103212), we get a palindrome (49343234394).

The spelling of 21230131182 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, one hundred eighty-two".