21310313033 has 4 divisors (see below), whose sum is σ = 21498899988. Its totient is φ = 21121726080.

The previous prime is 21310313023. The next prime is 21310313039. The reversal of 21310313033 is 33031301312.

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 8701718089 + 12608594944 = 93283^2 + 112288^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310313033 - 2²⁴ = 21293535817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21310312996 and 21310313014.

It is not an unprimeable number, because it can be changed into a prime (21310313039) 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, 94293308 + ... + 94293533.

It is an arithmetic number, because the mean of its divisors is an integer number (5374724997).

Almost surely, 2^21310313033 is an apocalyptic number.

It is an amenable number.

21310313033 is a deficient number, since it is larger than the sum of its proper divisors (188586955).

21310313033 is a wasteful number, since it uses less digits than its factorization.

21310313033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188586954.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21310313033 its reverse (33031301312), we get a palindrome (54341614345).

The spelling of 21310313033 in words is "twenty-one billion, three hundred ten million, three hundred thirteen thousand, thirty-three".