31302021121 has 16 divisors (see below), whose sum is σ = 35980483968. Its totient is φ = 26675510400.

The previous prime is 31302021119. The next prime is 31302021151. The reversal of 31302021121 is 12112020313.

It is not a de Polignac number, because 31302021121 - 2¹ = 31302021119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31302021095 and 31302021104.

It is not an unprimeable number, because it can be changed into a prime (31302021151) 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 in 15 ways as a sum of consecutive naturals, for example, 1485741 + ... + 1506661.

It is an arithmetic number, because the mean of its divisors is an integer number (2248780248).

Almost surely, 2^31302021121 is an apocalyptic number.

It is an amenable number.

31302021121 is a deficient number, since it is larger than the sum of its proper divisors (4678462847).

31302021121 is a wasteful number, since it uses less digits than its factorization.

31302021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22152.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31302021121 its reverse (12112020313), we get a palindrome (43414041434).

The spelling of 31302021121 in words is "thirty-one billion, three hundred two million, twenty-one thousand, one hundred twenty-one".