21031121130 has 32 divisors (see below), whose sum is σ = 50479383168. Its totient is φ = 5607777600.

The previous prime is 21031121113. The next prime is 21031121173. The reversal of 21031121130 is 3112113012.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381940 + ... + 433520.

It is an arithmetic number, because the mean of its divisors is an integer number (1577480724).

Almost surely, 2^21031121130 is an apocalyptic number.

21031121130 is an abundant number, since it is smaller than the sum of its proper divisors (29448262038).

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

21031121130 is a wasteful number, since it uses less digits than its factorization.

21031121130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65182.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21031121130 its reverse (3112113012), we get a palindrome (24143234142).

The spelling of 21031121130 in words is "twenty-one billion, thirty-one million, one hundred twenty-one thousand, one hundred thirty".