21511082130 has 16 divisors (see below), whose sum is σ = 51626597184. Its totient is φ = 5736288560.

The previous prime is 21511082081. The next prime is 21511082179. The reversal of 21511082130 is 3128011512.

It is an interprime number because it is at equal distance from previous prime (21511082081) and next prime (21511082179).

It is a self number, because there is not a number n which added to its sum of digits gives 21511082130.

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, 358518006 + ... + 358518065.

It is an arithmetic number, because the mean of its divisors is an integer number (3226662324).

Almost surely, 2^21511082130 is an apocalyptic number.

21511082130 is an abundant number, since it is smaller than the sum of its proper divisors (30115515054).

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

21511082130 is a wasteful number, since it uses less digits than its factorization.

21511082130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717036081.

The product of its (nonzero) digits is 480, while the sum is 24.

Adding to 21511082130 its reverse (3128011512), we get a palindrome (24639093642).

The spelling of 21511082130 in words is "twenty-one billion, five hundred eleven million, eighty-two thousand, one hundred thirty".