21135250310250 has 64 divisors (see below), whose sum is σ = 55856736853632. Its totient is φ = 5304533408000.

The previous prime is 21135250310219. The next prime is 21135250310261. The reversal of 21135250310250 is 5201305253112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 828820596 + ... + 828846095.

It is an arithmetic number, because the mean of its divisors is an integer number (872761513338).

Almost surely, 2^{21135250310250} is an apocalyptic number.

21135250310250 is an abundant number, since it is smaller than the sum of its proper divisors (34721486543382).

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

21135250310250 is a wasteful number, since it uses less digits than its factorization.

21135250310250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657666728 (or 1657666718 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 21135250310250 its reverse (5201305253112), we get a palindrome (26336555563362).

The spelling of 21135250310250 in words is "twenty-one trillion, one hundred thirty-five billion, two hundred fifty million, three hundred ten thousand, two hundred fifty".