21131031030 has 64 divisors (see below), whose sum is σ = 51225419520. Its totient is φ = 5578263936.

The previous prime is 21131031011. The next prime is 21131031091. The reversal of 21131031030 is 3013013112.

21131031030 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4978089 + ... + 4982331.

It is an arithmetic number, because the mean of its divisors is an integer number (800397180).

Almost surely, 2^21131031030 is an apocalyptic number.

21131031030 is an abundant number, since it is smaller than the sum of its proper divisors (30094388490).

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

21131031030 is a wasteful number, since it uses less digits than its factorization.

21131031030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5885.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21131031030 its reverse (3013013112), we get a palindrome (24144044142).

The spelling of 21131031030 in words is "twenty-one billion, one hundred thirty-one million, thirty-one thousand, thirty".