21135251130 has 128 divisors (see below), whose sum is σ = 59744563200. Its totient is φ = 4684546560.

The previous prime is 21135251129. The next prime is 21135251161. The reversal of 21135251130 is 3115253112.

It is a self number, because there is not a number n which added to its sum of digits gives 21135251130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1430521 + ... + 1445219.

It is an arithmetic number, because the mean of its divisors is an integer number (466754400).

Almost surely, 2^21135251130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21135251130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29872281600).

21135251130 is an abundant number, since it is smaller than the sum of its proper divisors (38609312070).

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

21135251130 is a wasteful number, since it uses less digits than its factorization.

21135251130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14924.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21135251130 in words is "twenty-one billion, one hundred thirty-five million, two hundred fifty-one thousand, one hundred thirty".