21505789130 has 32 divisors (see below), whose sum is σ = 46163983104. Its totient is φ = 7052829696.

The previous prime is 21505789117. The next prime is 21505789183. The reversal of 21505789130 is 3198750512.

It is a super-2 number, since 2×21505789130² (a number of 21 digits) contains 22 as substring.

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, 6677207 + ... + 6680426.

It is an arithmetic number, because the mean of its divisors is an integer number (1442624472).

Almost surely, 2^21505789130 is an apocalyptic number.

21505789130 is an abundant number, since it is smaller than the sum of its proper divisors (24658193974).

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

21505789130 is a wasteful number, since it uses less digits than its factorization.

21505789130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13357670.

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 21505789130 in words is "twenty-one billion, five hundred five million, seven hundred eighty-nine thousand, one hundred thirty".