21020113331 has 16 divisors (see below), whose sum is σ = 24621723840. Its totient is φ = 17568645120.

The previous prime is 21020113319. The next prime is 21020113357. The reversal of 21020113331 is 13331102012.

It is a cyclic number.

It is not a de Polignac number, because 21020113331 - 2¹⁸ = 21019851187 is a prime.

It is a super-3 number, since 3×21020113331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21020113381) 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, 564275 + ... + 600371.

It is an arithmetic number, because the mean of its divisors is an integer number (1538857740).

Almost surely, 2^21020113331 is an apocalyptic number.

21020113331 is a deficient number, since it is larger than the sum of its proper divisors (3601610509).

21020113331 is a wasteful number, since it uses less digits than its factorization.

21020113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38174.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21020113331 its reverse (13331102012), we get a palindrome (34351215343).

The spelling of 21020113331 in words is "twenty-one billion, twenty million, one hundred thirteen thousand, three hundred thirty-one".