21910552313 has 4 divisors (see below), whose sum is σ = 23595979428. Its totient is φ = 20225125200.

The previous prime is 21910552273. The next prime is 21910552333. The reversal of 21910552313 is 31325501912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8740006144 + 13170546169 = 93488^2 + 114763^2 .

It is a cyclic number.

It is not a de Polignac number, because 21910552313 - 2⁶ = 21910552249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21910552313.

It is not an unprimeable number, because it can be changed into a prime (21910552333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842713538 + ... + 842713563.

It is an arithmetic number, because the mean of its divisors is an integer number (5898994857).

Almost surely, 2^21910552313 is an apocalyptic number.

It is an amenable number.

21910552313 is a deficient number, since it is larger than the sum of its proper divisors (1685427115).

21910552313 is a wasteful number, since it uses less digits than its factorization.

21910552313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685427114.

The product of its (nonzero) digits is 8100, while the sum is 32.

The spelling of 21910552313 in words is "twenty-one billion, nine hundred ten million, five hundred fifty-two thousand, three hundred thirteen".