311222021 has 12 divisors (see below), whose sum is σ = 348018432. Its totient is φ = 276012000.

The previous prime is 311221969. The next prime is 311222057. The reversal of 311222021 is 120222113.

It is a happy number.

It is not a de Polignac number, because 311222021 - 2¹⁴ = 311205637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311221987 and 311222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311222081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10076 + ... + 26906.

It is an arithmetic number, because the mean of its divisors is an integer number (29001536).

Almost surely, 2^311222021 is an apocalyptic number.

It is an amenable number.

311222021 is a deficient number, since it is larger than the sum of its proper divisors (36796411).

311222021 is a wasteful number, since it uses less digits than its factorization.

311222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16924 (or 16883 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 311222021 is about 17641.4857934359. The cubic root of 311222021 is about 677.6780819341.

Adding to 311222021 its reverse (120222113), we get a palindrome (431444134).

The spelling of 311222021 in words is "three hundred eleven million, two hundred twenty-two thousand, twenty-one".