21150240250 has 32 divisors (see below), whose sum is σ = 40242348432. Its totient is φ = 8321400000.

The previous prime is 21150240239. The next prime is 21150240269. The reversal of 21150240250 is 5204205112.

It can be written as a sum of positive squares in 8 ways, for example, as 15186609 + 21135053641 = 3897^2 + 145379^2 .

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, 678201 + ... + 708700.

Almost surely, 2^21150240250 is an apocalyptic number.

21150240250 is a deficient number, since it is larger than the sum of its proper divisors (19092108182).

21150240250 is a wasteful number, since it uses less digits than its factorization.

21150240250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386979 (or 1386969 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21150240250 its reverse (5204205112), we get a palindrome (26354445362).

The spelling of 21150240250 in words is "twenty-one billion, one hundred fifty million, two hundred forty thousand, two hundred fifty".