331320021 has 8 divisors (see below), whose sum is σ = 467745984. Its totient is φ = 207887040.

The previous prime is 331320019. The next prime is 331320029. The reversal of 331320021 is 120023133.

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

It is not a de Polignac number, because 331320021 - 2¹ = 331320019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331320029) 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, 3248185 + ... + 3248286.

It is an arithmetic number, because the mean of its divisors is an integer number (58468248).

Almost surely, 2^331320021 is an apocalyptic number.

It is an amenable number.

331320021 is a deficient number, since it is larger than the sum of its proper divisors (136425963).

331320021 is a wasteful number, since it uses less digits than its factorization.

331320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496491.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 331320021 is about 18202.1982463657. The cubic root of 331320021 is about 691.9625015877.

Adding to 331320021 its reverse (120023133), we get a palindrome (451343154).

The spelling of 331320021 in words is "three hundred thirty-one million, three hundred twenty thousand, twenty-one".