21004120331 has 8 divisors (see below), whose sum is σ = 21253723344. Its totient is φ = 20755192320.

The previous prime is 21004120307. The next prime is 21004120337. The reversal of 21004120331 is 13302140012.

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 21004120331 - 2¹⁰ = 21004119307 is a prime.

It is a super-2 number, since 2×21004120331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004120337) 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, 106010 + ... + 230751.

It is an arithmetic number, because the mean of its divisors is an integer number (2656715418).

Almost surely, 2^21004120331 is an apocalyptic number.

21004120331 is a deficient number, since it is larger than the sum of its proper divisors (249603013).

21004120331 is an equidigital number, since it uses as much as digits as its factorization.

21004120331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337501.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21004120331 its reverse (13302140012), we get a palindrome (34306260343).

The spelling of 21004120331 in words is "twenty-one billion, four million, one hundred twenty thousand, three hundred thirty-one".