21303331302061 has 2 divisors, whose sum is σ = 21303331302062. Its totient is φ = 21303331302060.

The previous prime is 21303331301909. The next prime is 21303331302101. The reversal of 21303331302061 is 16020313330312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20383247477961 + 920083824100 = 4514781^2 + 959210^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303331302061 - 2²⁵ = 21303297747629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303331342061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651665651030 + 10651665651031.

It is an arithmetic number, because the mean of its divisors is an integer number (10651665651031).

Almost surely, 2^{21303331302061} is an apocalyptic number.

It is an amenable number.

21303331302061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303331302061 is an equidigital number, since it uses as much as digits as its factorization.

21303331302061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21303331302061 its reverse (16020313330312), we get a palindrome (37323644632373).

The spelling of 21303331302061 in words is "twenty-one trillion, three hundred three billion, three hundred thirty-one million, three hundred two thousand, sixty-one".