312101210221 has 4 divisors (see below), whose sum is σ = 312111350944. Its totient is φ = 312091069500.

The previous prime is 312101210209. The next prime is 312101210233. The reversal of 312101210221 is 122012101213.

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 an interprime number because it is at equal distance from previous prime (312101210209) and next prime (312101210233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312101210221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312101210195 and 312101210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312101250221) 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, 5024055 + ... + 5085796.

It is an arithmetic number, because the mean of its divisors is an integer number (78027837736).

Almost surely, 2^312101210221 is an apocalyptic number.

It is an amenable number.

312101210221 is a deficient number, since it is larger than the sum of its proper divisors (10140723).

312101210221 is a wasteful number, since it uses less digits than its factorization.

312101210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10140722.

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

Adding to 312101210221 its reverse (122012101213), we get a palindrome (434113311434).

The spelling of 312101210221 in words is "three hundred twelve billion, one hundred one million, two hundred ten thousand, two hundred twenty-one".