21042030331 has 16 divisors (see below), whose sum is σ = 24585993216. Its totient is φ = 17633379456.

The previous prime is 21042030299. The next prime is 21042030413. The reversal of 21042030331 is 13303024012.

It is not a de Polignac number, because 21042030331 - 2⁵ = 21042030299 is a prime.

It is a super-2 number, since 2×21042030331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21042030299 and 21042030308.

It is not an unprimeable number, because it can be changed into a prime (21042030131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277795 + ... + 345331.

It is an arithmetic number, because the mean of its divisors is an integer number (1536624576).

Almost surely, 2^21042030331 is an apocalyptic number.

21042030331 is a deficient number, since it is larger than the sum of its proper divisors (3543962885).

21042030331 is an equidigital number, since it uses as much as digits as its factorization.

21042030331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68538.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21042030331 its reverse (13303024012), we get a palindrome (34345054343).

The spelling of 21042030331 in words is "twenty-one billion, forty-two million, thirty thousand, three hundred thirty-one".