21330313331 has 4 divisors (see below), whose sum is σ = 21334429200. Its totient is φ = 21326197464.

The previous prime is 21330313283. The next prime is 21330313351. The reversal of 21330313331 is 13331303312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21330313331 - 2³⁴ = 4150444147 is a prime.

It is a super-2 number, since 2×21330313331² (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 = 21330313297 and 21330313306.

It is not an unprimeable number, because it can be changed into a prime (21330313351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050151 + ... + 2060528.

It is an arithmetic number, because the mean of its divisors is an integer number (5333607300).

Almost surely, 2^21330313331 is an apocalyptic number.

21330313331 is a deficient number, since it is larger than the sum of its proper divisors (4115869).

21330313331 is an equidigital number, since it uses as much as digits as its factorization.

21330313331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115868.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 21330313331 its reverse (13331303312), we get a palindrome (34661616643).

The spelling of 21330313331 in words is "twenty-one billion, three hundred thirty million, three hundred thirteen thousand, three hundred thirty-one".