30313312021 has 4 divisors (see below), whose sum is σ = 30314371500. Its totient is φ = 30312252544.

The previous prime is 30313312019. The next prime is 30313312033. The reversal of 30313312021 is 12021331303.

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 24820427025 + 5492884996 = 157545^2 + 74114^2 .

It is a cyclic number.

It is not a de Polignac number, because 30313312021 - 2¹ = 30313312019 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 30313312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30313312621) 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, 485596 + ... + 544453.

It is an arithmetic number, because the mean of its divisors is an integer number (7578592875).

Almost surely, 2^30313312021 is an apocalyptic number.

It is an amenable number.

30313312021 is a deficient number, since it is larger than the sum of its proper divisors (1059479).

30313312021 is a wasteful number, since it uses less digits than its factorization.

30313312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059478.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 30313312021 its reverse (12021331303), we get a palindrome (42334643324).

The spelling of 30313312021 in words is "thirty billion, three hundred thirteen million, three hundred twelve thousand, twenty-one".