331968021 has 32 divisors (see below), whose sum is σ = 565318656. Its totient is φ = 168240000.

The previous prime is 331967983. The next prime is 331968037. The reversal of 331968021 is 120869133.

It is not a de Polignac number, because 331968021 - 2⁹ = 331967509 is a prime.

It is a super-2 number, since 2×331968021² = 220405533933312882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331968071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8055 + ... + 26996.

It is an arithmetic number, because the mean of its divisors is an integer number (17666208).

Almost surely, 2^331968021 is an apocalyptic number.

It is an amenable number.

331968021 is a deficient number, since it is larger than the sum of its proper divisors (233350635).

331968021 is a wasteful number, since it uses less digits than its factorization.

331968021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35113.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 331968021 is about 18219.9895993384. The cubic root of 331968021 is about 692.4133242229.

The spelling of 331968021 in words is "three hundred thirty-one million, nine hundred sixty-eight thousand, twenty-one".