31130202121 has 4 divisors (see below), whose sum is σ = 31568655744. Its totient is φ = 30691748500.

The previous prime is 31130202109. The next prime is 31130202157. The reversal of 31130202121 is 12120203113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31130202121 - 2¹³ = 31130193929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31130202095 and 31130202104.

It is not an unprimeable number, because it can be changed into a prime (31130202101) 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, 219226705 + ... + 219226846.

It is an arithmetic number, because the mean of its divisors is an integer number (7892163936).

Almost surely, 2^31130202121 is an apocalyptic number.

It is an amenable number.

31130202121 is a deficient number, since it is larger than the sum of its proper divisors (438453623).

31130202121 is an equidigital number, since it uses as much as digits as its factorization.

31130202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438453622.

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

Adding to 31130202121 its reverse (12120203113), we get a palindrome (43250405234).

The spelling of 31130202121 in words is "thirty-one billion, one hundred thirty million, two hundred two thousand, one hundred twenty-one".