313020021 has 4 divisors (see below), whose sum is σ = 417360032. Its totient is φ = 208680012.

The previous prime is 313020017. The next prime is 313020023. The reversal of 313020021 is 120020313.

It is a happy number.

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 not a de Polignac number, because 313020021 - 2² = 313020017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313019979 and 313020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313020023) 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, 52170001 + ... + 52170006.

It is an arithmetic number, because the mean of its divisors is an integer number (104340008).

Almost surely, 2^313020021 is an apocalyptic number.

It is an amenable number.

313020021 is a deficient number, since it is larger than the sum of its proper divisors (104340011).

313020021 is a wasteful number, since it uses less digits than its factorization.

313020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104340010.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 313020021 is about 17692.3718308202. The cubic root of 313020021 is about 678.9806099921.

Adding to 313020021 its reverse (120020313), we get a palindrome (433040334).

The spelling of 313020021 in words is "three hundred thirteen million, twenty thousand, twenty-one".