21250253435330 has 16 divisors (see below), whose sum is σ = 38250531833400. Its totient is φ = 8500084563072.

The previous prime is 21250253435249. The next prime is 21250253435387. The reversal of 21250253435330 is 3353435205212.

It can be written as a sum of positive squares in 4 ways, for example, as 14782402454521 + 6467850980809 = 3844789^2 + 2543197^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4071032 + ... + 7685948.

Almost surely, 2^{21250253435330} is an apocalyptic number.

21250253435330 is a deficient number, since it is larger than the sum of its proper divisors (17000278398070).

21250253435330 is a wasteful number, since it uses less digits than its factorization.

21250253435330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202773.

The product of its (nonzero) digits is 324000, while the sum is 38.

The spelling of 21250253435330 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-five thousand, three hundred thirty".