21121032313 has 4 divisors (see below), whose sum is σ = 21802355968. Its totient is φ = 20439708660.

The previous prime is 21121032299. The next prime is 21121032329. The reversal of 21121032313 is 31323012112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21121032313 - 2⁹ = 21121031801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121032113) 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, 340661781 + ... + 340661842.

It is an arithmetic number, because the mean of its divisors is an integer number (5450588992).

Almost surely, 2^21121032313 is an apocalyptic number.

It is an amenable number.

21121032313 is a deficient number, since it is larger than the sum of its proper divisors (681323655).

21121032313 is an equidigital number, since it uses as much as digits as its factorization.

21121032313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681323654.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21121032313 its reverse (31323012112), we get a palindrome (52444044425).

The spelling of 21121032313 in words is "twenty-one billion, one hundred twenty-one million, thirty-two thousand, three hundred thirteen".