21131431230 has 64 divisors (see below), whose sum is σ = 62419004928. Its totient is φ = 4458499200.

The previous prime is 21131431199. The next prime is 21131431261. The reversal of 21131431230 is 3213413112.

It is an interprime number because it is at equal distance from previous prime (21131431199) and next prime (21131431261).

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 = 21131431197 and 21131431206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3867496 + ... + 3872955.

It is an arithmetic number, because the mean of its divisors is an integer number (975296952).

Almost surely, 2^21131431230 is an apocalyptic number.

21131431230 is an abundant number, since it is smaller than the sum of its proper divisors (41287573698).

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

21131431230 is a wasteful number, since it uses less digits than its factorization.

21131431230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740481.

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

Adding to 21131431230 its reverse (3213413112), we get a palindrome (24344844342).

The spelling of 21131431230 in words is "twenty-one billion, one hundred thirty-one million, four hundred thirty-one thousand, two hundred thirty".