21112312130 has 64 divisors (see below), whose sum is σ = 47086099200. Its totient is φ = 6636812544.

The previous prime is 21112312057. The next prime is 21112312159. The reversal of 21112312130 is 3121321112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21112312099 and 21112312108.

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, 57737 + ... + 213443.

It is an arithmetic number, because the mean of its divisors is an integer number (735720300).

Almost surely, 2^21112312130 is an apocalyptic number.

21112312130 is an abundant number, since it is smaller than the sum of its proper divisors (25973787070).

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

21112312130 is a wasteful number, since it uses less digits than its factorization.

21112312130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155883.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112312130 its reverse (3121321112), we get a palindrome (24233633242).

The spelling of 21112312130 in words is "twenty-one billion, one hundred twelve million, three hundred twelve thousand, one hundred thirty".