31210000121 has 8 divisors (see below), whose sum is σ = 32587387584. Its totient is φ = 29834315280.

The previous prime is 31210000097. The next prime is 31210000123. The reversal of 31210000121 is 12100001213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31210000121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31210000123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388115 + ... + 461576.

It is an arithmetic number, because the mean of its divisors is an integer number (4073423448).

Almost surely, 2^31210000121 is an apocalyptic number.

It is an amenable number.

31210000121 is a deficient number, since it is larger than the sum of its proper divisors (1377387463).

31210000121 is a wasteful number, since it uses less digits than its factorization.

31210000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851311.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31210000121 its reverse (12100001213), we get a palindrome (43310001334).

It can be divided in two parts, 3 and 1210000121, that multiplied together give a palindrome (3630000363).

The spelling of 31210000121 in words is "thirty-one billion, two hundred ten million, one hundred twenty-one", and thus it is an aban number.