312142021 has 4 divisors (see below), whose sum is σ = 312275392. Its totient is φ = 312008652.

The previous prime is 312141967. The next prime is 312142043. The reversal of 312142021 is 120241213.

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 312142021 - 2¹¹ = 312139973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312141986 and 312142004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312143021) 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, 63111 + ... + 67876.

It is an arithmetic number, because the mean of its divisors is an integer number (78068848).

Almost surely, 2^312142021 is an apocalyptic number.

It is an amenable number.

312142021 is a deficient number, since it is larger than the sum of its proper divisors (133371).

312142021 is a wasteful number, since it uses less digits than its factorization.

312142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133370.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 312142021 is about 17667.5414531847. The cubic root of 312142021 is about 678.3451839407.

Adding to 312142021 its reverse (120241213), we get a palindrome (432383234).

The spelling of 312142021 in words is "three hundred twelve million, one hundred forty-two thousand, twenty-one".