21023012130 has 32 divisors (see below), whose sum is σ = 50473507968. Its totient is φ = 5604105600.

The previous prime is 21023012119. The next prime is 21023012177. The reversal of 21023012130 is 3121032012.

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, 41811 + ... + 209270.

It is an arithmetic number, because the mean of its divisors is an integer number (1577297124).

Almost surely, 2^21023012130 is an apocalyptic number.

21023012130 is an abundant number, since it is smaller than the sum of its proper divisors (29450495838).

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

21023012130 is a wasteful number, since it uses less digits than its factorization.

21023012130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253882.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21023012130 its reverse (3121032012), we get a palindrome (24144044142).

The spelling of 21023012130 in words is "twenty-one billion, twenty-three million, twelve thousand, one hundred thirty".