31212113200121 has 4 divisors (see below), whose sum is σ = 35670986514432. Its totient is φ = 26753239885812.

The previous prime is 31212113200027. The next prime is 31212113200123. The reversal of 31212113200121 is 12100231121213.

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 31212113200121 - 2²² = 31212109005817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212113200093 and 31212113200102.

It is not an unprimeable number, because it can be changed into a prime (31212113200123) 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, 2229436657145 + ... + 2229436657158.

It is an arithmetic number, because the mean of its divisors is an integer number (8917746628608).

Almost surely, 2^{31212113200121} is an apocalyptic number.

It is an amenable number.

31212113200121 is a deficient number, since it is larger than the sum of its proper divisors (4458873314311).

31212113200121 is an equidigital number, since it uses as much as digits as its factorization.

31212113200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458873314310.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31212113200121 its reverse (12100231121213), we get a palindrome (43312344321334).

The spelling of 31212113200121 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, two hundred thousand, one hundred twenty-one".