21120331 has 8 divisors (see below), whose sum is σ = 21965184. Its totient is φ = 20285760.

The previous prime is 21120317. The next prime is 21120349. The reversal of 21120331 is 13302112.

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

It is a cyclic number.

It is not a de Polignac number, because 21120331 - 2¹³ = 21112139 is a prime.

It is a super-3 number, since 3×21120331³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120311) 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, 1761 + ... + 6733.

It is an arithmetic number, because the mean of its divisors is an integer number (2745648).

Almost surely, 2^21120331 is an apocalyptic number.

21120331 is a deficient number, since it is larger than the sum of its proper divisors (844853).

21120331 is a wasteful number, since it uses less digits than its factorization.

21120331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21120331 is about 4595.6861294044. The cubic root of 21120331 is about 276.4183732271.

Adding to 21120331 its reverse (13302112), we get a palindrome (34422443).

The spelling of 21120331 in words is "twenty-one million, one hundred twenty thousand, three hundred thirty-one".