312102021 has 24 divisors (see below), whose sum is σ = 528086304. Its totient is φ = 162130080.

The previous prime is 312101981. The next prime is 312102023. The reversal of 312102021 is 120201213.

It is not a de Polignac number, because 312102021 - 2²⁵ = 278547589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312101988 and 312102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312102023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94890 + ... + 98123.

It is an arithmetic number, because the mean of its divisors is an integer number (22003596).

Almost surely, 2^312102021 is an apocalyptic number.

It is an amenable number.

312102021 is a deficient number, since it is larger than the sum of its proper divisors (215984283).

312102021 is a wasteful number, since it uses less digits than its factorization.

312102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193041 (or 193034 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 312102021 is about 17666.4093974978. The cubic root of 312102021 is about 678.3162067822.

Adding to 312102021 its reverse (120201213), we get a palindrome (432303234).

The spelling of 312102021 in words is "three hundred twelve million, one hundred two thousand, twenty-one".