31220121312253 has 2 divisors, whose sum is σ = 31220121312254. Its totient is φ = 31220121312252.

The previous prime is 31220121312181. The next prime is 31220121312307. The reversal of 31220121312253 is 35221312102213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15894877238244 + 15325244074009 = 3986838^2 + 3914747^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220121312253 - 2¹³ = 31220121304061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220121312053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610060656126 + 15610060656127.

It is an arithmetic number, because the mean of its divisors is an integer number (15610060656127).

Almost surely, 2^{31220121312253} is an apocalyptic number.

It is an amenable number.

31220121312253 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220121312253 is an equidigital number, since it uses as much as digits as its factorization.

31220121312253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 31220121312253 its reverse (35221312102213), we get a palindrome (66441433414466).

The spelling of 31220121312253 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred twelve thousand, two hundred fifty-three".