21650205313 has 8 divisors (see below), whose sum is σ = 25007724000. Its totient is φ = 18524239680.

The previous prime is 21650205307. The next prime is 21650205323. The reversal of 21650205313 is 31350205612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21650205313 - 2²¹ = 21648108161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21650205323) 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, 57888063 + ... + 57888436.

It is an arithmetic number, because the mean of its divisors is an integer number (3125965500).

Almost surely, 2^21650205313 is an apocalyptic number.

It is an amenable number.

21650205313 is a deficient number, since it is larger than the sum of its proper divisors (3357518687).

21650205313 is a wasteful number, since it uses less digits than its factorization.

21650205313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115776527.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 21650205313 in words is "twenty-one billion, six hundred fifty million, two hundred five thousand, three hundred thirteen".