31120020210121 has 4 divisors (see below), whose sum is σ = 31174521121744. Its totient is φ = 31065519298500.

The previous prime is 31120020210053. The next prime is 31120020210151. The reversal of 31120020210121 is 12101202002113.

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 31120020210121 - 2¹³ = 31120020201929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31120020210095 and 31120020210104.

It is not an unprimeable number, because it can be changed into a prime (31120020210151) 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, 27250454955 + ... + 27250456096.

It is an arithmetic number, because the mean of its divisors is an integer number (7793630280436).

Almost surely, 2^{31120020210121} is an apocalyptic number.

It is an amenable number.

31120020210121 is a deficient number, since it is larger than the sum of its proper divisors (54500911623).

31120020210121 is an equidigital number, since it uses as much as digits as its factorization.

31120020210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54500911622.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31120020210121 its reverse (12101202002113), we get a palindrome (43221222212234).

The spelling of 31120020210121 in words is "thirty-one trillion, one hundred twenty billion, twenty million, two hundred ten thousand, one hundred twenty-one".