312030221 has 4 divisors (see below), whose sum is σ = 322095744. Its totient is φ = 301964700.

The previous prime is 312030211. The next prime is 312030263. The reversal of 312030221 is 122030213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122030213 = 9421 ⋅12953.

It is a cyclic number.

It is not a de Polignac number, because 312030221 - 2¹⁰ = 312029197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312030196 and 312030205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312030211) 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, 5032715 + ... + 5032776.

It is an arithmetic number, because the mean of its divisors is an integer number (80523936).

Almost surely, 2^312030221 is an apocalyptic number.

312030221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

312030221 is a deficient number, since it is larger than the sum of its proper divisors (10065523).

312030221 is a wasteful number, since it uses less digits than its factorization.

312030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065522.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 312030221 is about 17664.3771755474. The cubic root of 312030221 is about 678.2641865713.

Adding to 312030221 its reverse (122030213), we get a palindrome (434060434).

The spelling of 312030221 in words is "three hundred twelve million, thirty thousand, two hundred twenty-one".