31302402121 has 4 divisors (see below), whose sum is σ = 31357415700. Its totient is φ = 31247388544.

The previous prime is 31302402101. The next prime is 31302402127. The reversal of 31302402121 is 12120420313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12120420313 = 41761 ⋅290233.

It can be written as a sum of positive squares in 2 ways, for example, as 20011214521 + 11291187600 = 141461^2 + 106260^2 .

It is a cyclic number.

It is not a de Polignac number, because 31302402121 - 2¹³ = 31302393929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31302402127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27505936 + ... + 27507073.

It is an arithmetic number, because the mean of its divisors is an integer number (7839353925).

Almost surely, 2^31302402121 is an apocalyptic number.

It is an amenable number.

31302402121 is a deficient number, since it is larger than the sum of its proper divisors (55013579).

31302402121 is an equidigital number, since it uses as much as digits as its factorization.

31302402121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55013578.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31302402121 its reverse (12120420313), we get a palindrome (43422822434).

The spelling of 31302402121 in words is "thirty-one billion, three hundred two million, four hundred two thousand, one hundred twenty-one".