21321103331 has 16 divisors (see below), whose sum is σ = 23404399200. Its totient is φ = 19262131200.

The previous prime is 21321103277. The next prime is 21321103393. The reversal of 21321103331 is 13330112312.

It is a cyclic number.

It is not a de Polignac number, because 21321103331 - 2¹⁰ = 21321102307 is a prime.

It is a super-2 number, since 2×21321103331² (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 (21321103031) 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, 3758165 + ... + 3763833.

It is an arithmetic number, because the mean of its divisors is an integer number (1462774950).

Almost surely, 2^21321103331 is an apocalyptic number.

21321103331 is a deficient number, since it is larger than the sum of its proper divisors (2083295869).

21321103331 is a wasteful number, since it uses less digits than its factorization.

21321103331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7750.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21321103331 its reverse (13330112312), we get a palindrome (34651215643).

The spelling of 21321103331 in words is "twenty-one billion, three hundred twenty-one million, one hundred three thousand, three hundred thirty-one".