21130420412 has 12 divisors (see below), whose sum is σ = 37317486360. Its totient is φ = 10468281456.

The previous prime is 21130420397. The next prime is 21130420427. The reversal of 21130420412 is 21402403112.

It is an interprime number because it is at equal distance from previous prime (21130420397) and next prime (21130420427).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24231698 + ... + 24232569.

It is an arithmetic number, because the mean of its divisors is an integer number (3109790530).

Almost surely, 2^21130420412 is an apocalyptic number.

It is an amenable number.

21130420412 is a deficient number, since it is larger than the sum of its proper divisors (16187065948).

21130420412 is a wasteful number, since it uses less digits than its factorization.

21130420412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48464380 (or 48464378 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21130420412 its reverse (21402403112), we get a palindrome (42532823524).

The spelling of 21130420412 in words is "twenty-one billion, one hundred thirty million, four hundred twenty thousand, four hundred twelve".