31201332121 has 2 divisors, whose sum is σ = 31201332122. Its totient is φ = 31201332120.

The previous prime is 31201332103. The next prime is 31201332161. The reversal of 31201332121 is 12123310213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26531523225 + 4669808896 = 162885^2 + 68336^2 .

It is a cyclic number.

It is not a de Polignac number, because 31201332121 - 2¹³ = 31201323929 is a prime.

It is a super-2 number, since 2×31201332121² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31201332161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600666060 + 15600666061.

It is an arithmetic number, because the mean of its divisors is an integer number (15600666061).

Almost surely, 2^31201332121 is an apocalyptic number.

It is an amenable number.

31201332121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201332121 is an equidigital number, since it uses as much as digits as its factorization.

31201332121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31201332121 its reverse (12123310213), we get a palindrome (43324642334).

The spelling of 31201332121 in words is "thirty-one billion, two hundred one million, three hundred thirty-two thousand, one hundred twenty-one".