21152212530 has 32 divisors (see below), whose sum is σ = 50795956224. Its totient is φ = 5637184896.

The previous prime is 21152212511. The next prime is 21152212541. The reversal of 21152212530 is 3521225112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152212530.

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, 162099 + ... + 261878.

It is an arithmetic number, because the mean of its divisors is an integer number (1587373632).

Almost surely, 2^21152212530 is an apocalyptic number.

21152212530 is an abundant number, since it is smaller than the sum of its proper divisors (29643743694).

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

21152212530 is a wasteful number, since it uses less digits than its factorization.

21152212530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425650.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21152212530 its reverse (3521225112), we get a palindrome (24673437642).

The spelling of 21152212530 in words is "twenty-one billion, one hundred fifty-two million, two hundred twelve thousand, five hundred thirty".