21202101331 has 2 divisors, whose sum is σ = 21202101332. Its totient is φ = 21202101330.

The previous prime is 21202101299. The next prime is 21202101337. The reversal of 21202101331 is 13310120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202101331 - 2⁵ = 21202101299 is a prime.

It is a super-2 number, since 2×21202101331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21202101337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601050665 + 10601050666.

It is an arithmetic number, because the mean of its divisors is an integer number (10601050666).

Almost surely, 2^21202101331 is an apocalyptic number.

21202101331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202101331 is an equidigital number, since it uses as much as digits as its factorization.

21202101331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21202101331 its reverse (13310120212), we get a palindrome (34512221543).

The spelling of 21202101331 in words is "twenty-one billion, two hundred two million, one hundred one thousand, three hundred thirty-one".