31212023130221 has 2 divisors, whose sum is σ = 31212023130222. Its totient is φ = 31212023130220.

The previous prime is 31212023130209. The next prime is 31212023130263. The reversal of 31212023130221 is 12203132021213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16510089954121 + 14701933176100 = 4063261^2 + 3834310^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212023130221 - 2⁶ = 31212023130157 is a prime.

It is a super-2 number, since 2×31212023130221² (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 (31212023130521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606011565110 + 15606011565111.

It is an arithmetic number, because the mean of its divisors is an integer number (15606011565111).

Almost surely, 2^{31212023130221} is an apocalyptic number.

It is an amenable number.

31212023130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212023130221 is an equidigital number, since it uses as much as digits as its factorization.

31212023130221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31212023130221 its reverse (12203132021213), we get a palindrome (43415155151434).

The spelling of 31212023130221 in words is "thirty-one trillion, two hundred twelve billion, twenty-three million, one hundred thirty thousand, two hundred twenty-one".