21513124422250 has 32 divisors (see below), whose sum is σ = 42023550187008. Its totient is φ = 8231108472400.

The previous prime is 21513124422221. The next prime is 21513124422269. The reversal of 21513124422250 is 5222442131512.

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, 1870700722 + ... + 1870712221.

It is an arithmetic number, because the mean of its divisors is an integer number (1313235943344).

Almost surely, 2^{21513124422250} is an apocalyptic number.

21513124422250 is a deficient number, since it is larger than the sum of its proper divisors (20510425764758).

21513124422250 is a wasteful number, since it uses less digits than its factorization.

21513124422250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3741412983 (or 3741412973 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21513124422250 its reverse (5222442131512), we get a palindrome (26735566553762).

The spelling of 21513124422250 in words is "twenty-one trillion, five hundred thirteen billion, one hundred twenty-four million, four hundred twenty-two thousand, two hundred fifty".