331772021 has 8 divisors (see below), whose sum is σ = 380569344. Its totient is φ = 283325040.

The previous prime is 331771991. The next prime is 331772029. The reversal of 331772021 is 120277133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331772021 is a prime.

It is a super-2 number, since 2×331772021² = 220145347836848882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331772029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85550 + ... + 89343.

It is an arithmetic number, because the mean of its divisors is an integer number (47571168).

Almost surely, 2^331772021 is an apocalyptic number.

It is an amenable number.

331772021 is a deficient number, since it is larger than the sum of its proper divisors (48797323).

331772021 is a wasteful number, since it uses less digits than its factorization.

331772021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175171.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 331772021 is about 18214.6100973916. The cubic root of 331772021 is about 692.2770262254.

The spelling of 331772021 in words is "three hundred thirty-one million, seven hundred seventy-two thousand, twenty-one".