312003011021 has 4 divisors (see below), whose sum is σ = 336003242652. Its totient is φ = 288002779392.

The previous prime is 312003011003. The next prime is 312003011057. The reversal of 312003011021 is 120110300213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50663257225 + 261339753796 = 225085^2 + 511214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312003011021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312003010987 and 312003011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312003017021) 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, 12000115796 + ... + 12000115821.

It is an arithmetic number, because the mean of its divisors is an integer number (84000810663).

Almost surely, 2^312003011021 is an apocalyptic number.

It is an amenable number.

312003011021 is a deficient number, since it is larger than the sum of its proper divisors (24000231631).

312003011021 is a wasteful number, since it uses less digits than its factorization.

312003011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24000231630.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 312003011021 its reverse (120110300213), we get a palindrome (432113311234).

The spelling of 312003011021 in words is "three hundred twelve billion, three million, eleven thousand, twenty-one".