21921506130 has 16 divisors (see below), whose sum is σ = 52611614784. Its totient is φ = 5845734960.

The previous prime is 21921506093. The next prime is 21921506141. The reversal of 21921506130 is 3160512912.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 730716871 = 21921506130 / (2 + 1 + 9 + 2 + 1 + 5 + 0 + 6 + 1 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365358406 + ... + 365358465.

It is an arithmetic number, because the mean of its divisors is an integer number (3288225924).

Almost surely, 2^21921506130 is an apocalyptic number.

21921506130 is an abundant number, since it is smaller than the sum of its proper divisors (30690108654).

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

21921506130 is a wasteful number, since it uses less digits than its factorization.

21921506130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730716881.

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 21921506130 in words is "twenty-one billion, nine hundred twenty-one million, five hundred six thousand, one hundred thirty".