21103620250 has 16 divisors (see below), whose sum is σ = 39505977576. Its totient is φ = 8441448000.

The previous prime is 21103620203. The next prime is 21103620253. The reversal of 21103620250 is 5202630112.

It can be written as a sum of positive squares in 4 ways, for example, as 10557768001 + 10545852249 = 102751^2 + 102693^2 .

It is not an unprimeable number, because it can be changed into a prime (21103620253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42206991 + ... + 42207490.

Almost surely, 2^21103620250 is an apocalyptic number.

21103620250 is a deficient number, since it is larger than the sum of its proper divisors (18402357326).

21103620250 is an equidigital number, since it uses as much as digits as its factorization.

21103620250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84414498 (or 84414488 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The spelling of 21103620250 in words is "twenty-one billion, one hundred three million, six hundred twenty thousand, two hundred fifty".