31012200221021 has 2 divisors, whose sum is σ = 31012200221022. Its totient is φ = 31012200221020.

The previous prime is 31012200220987. The next prime is 31012200221071. The reversal of 31012200221021 is 12012200221013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17334407498521 + 13677792722500 = 4163461^2 + 3698350^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012200221021 - 2²⁶ = 31012133112157 is a prime.

It is a super-2 number, since 2×31012200221021² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012200221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506100110510 + 15506100110511.

It is an arithmetic number, because the mean of its divisors is an integer number (15506100110511).

Almost surely, 2^{31012200221021} is an apocalyptic number.

It is an amenable number.

31012200221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012200221021 is an equidigital number, since it uses as much as digits as its factorization.

31012200221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31012200221021 its reverse (12012200221013), we get a palindrome (43024400442034).

The spelling of 31012200221021 in words is "thirty-one trillion, twelve billion, two hundred million, two hundred twenty-one thousand, twenty-one".