21125230522 has 24 divisors (see below), whose sum is σ = 36663631200. Its totient is φ = 9096987240.

The previous prime is 21125230517. The next prime is 21125230543. The reversal of 21125230522 is 22503252112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2292622 + ... + 2301817.

It is an arithmetic number, because the mean of its divisors is an integer number (1527651300).

Almost surely, 2^21125230522 is an apocalyptic number.

21125230522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21125230522 is a deficient number, since it is larger than the sum of its proper divisors (15538400678).

21125230522 is a wasteful number, since it uses less digits than its factorization.

21125230522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594482 (or 4594471 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21125230522 its reverse (22503252112), we get a palindrome (43628482634).

The spelling of 21125230522 in words is "twenty-one billion, one hundred twenty-five million, two hundred thirty thousand, five hundred twenty-two".