131220021953 has 2 divisors, whose sum is σ = 131220021954. Its totient is φ = 131220021952.

The previous prime is 131220021929. The next prime is 131220022013. The reversal of 131220021953 is 359120022131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114739367824 + 16480654129 = 338732^2 + 128377^2 .

It is a cyclic number.

It is not a de Polignac number, because 131220021953 - 2¹⁸ = 131219759809 is a prime.

It is a super-2 number, since 2×131220021953² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131220026953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610010976 + 65610010977.

It is an arithmetic number, because the mean of its divisors is an integer number (65610010977).

Almost surely, 2^131220021953 is an apocalyptic number.

It is an amenable number.

131220021953 is a deficient number, since it is larger than the sum of its proper divisors (1).

131220021953 is an equidigital number, since it uses as much as digits as its factorization.

131220021953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 131220021953 in words is "one hundred thirty-one billion, two hundred twenty million, twenty-one thousand, nine hundred fifty-three".