21250208313 has 12 divisors (see below), whose sum is σ = 31408577200. Its totient is φ = 13837344696.

The previous prime is 21250208311. The next prime is 21250208327. The reversal of 21250208313 is 31380205212.

It is not a de Polignac number, because 21250208313 - 2¹ = 21250208311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250208311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27454663 + ... + 27455436.

Almost surely, 2^21250208313 is an apocalyptic number.

It is an amenable number.

21250208313 is a deficient number, since it is larger than the sum of its proper divisors (10158368887).

21250208313 is a wasteful number, since it uses less digits than its factorization.

21250208313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54910148 (or 54910145 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21250208313 in words is "twenty-one billion, two hundred fifty million, two hundred eight thousand, three hundred thirteen".