312210121 has 8 divisors (see below), whose sum is σ = 325861704. Its totient is φ = 298846080.

The previous prime is 312210113. The next prime is 312210137. The reversal of 312210121 is 121012213.

It can be written as a sum of positive squares in 4 ways, for example, as 100100025 + 212110096 = 10005^2 + 14564^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 312210121 - 2³ = 312210113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312210191) 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, 69666 + ... + 74011.

It is an arithmetic number, because the mean of its divisors is an integer number (40732713).

Almost surely, 2^312210121 is an apocalyptic number.

It is an amenable number.

312210121 is a deficient number, since it is larger than the sum of its proper divisors (13651583).

312210121 is a wasteful number, since it uses less digits than its factorization.

312210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143771.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 312210121 is about 17669.4686111383. The cubic root of 312210121 is about 678.3945118586.

Adding to 312210121 its reverse (121012213), we get a palindrome (433222334).

The spelling of 312210121 in words is "three hundred twelve million, two hundred ten thousand, one hundred twenty-one".