21202222331 has 2 divisors, whose sum is σ = 21202222332. Its totient is φ = 21202222330.

The previous prime is 21202222213. The next prime is 21202222361. The reversal of 21202222331 is 13322220212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202222331 - 2³⁴ = 4022353147 is a prime.

It is a super-2 number, since 2×21202222331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21202222361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601111165 + 10601111166.

It is an arithmetic number, because the mean of its divisors is an integer number (10601111166).

Almost surely, 2^21202222331 is an apocalyptic number.

21202222331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202222331 is an equidigital number, since it uses as much as digits as its factorization.

21202222331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21202222331 its reverse (13322220212), we get a palindrome (34524442543).

The spelling of 21202222331 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, three hundred thirty-one".