21102002331 has 16 divisors (see below), whose sum is σ = 28910959104. Its totient is φ = 13684197024.

The previous prime is 21102002323. The next prime is 21102002347. The reversal of 21102002331 is 13320020112.

It is not a de Polignac number, because 21102002331 - 2³ = 21102002323 is a prime.

It is a super-3 number, since 3×21102002331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21102002331.

It is not an unprimeable number, because it can be changed into a prime (21102002321) 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, 436096 + ... + 482061.

It is an arithmetic number, because the mean of its divisors is an integer number (1806934944).

Almost surely, 2^21102002331 is an apocalyptic number.

21102002331 is a deficient number, since it is larger than the sum of its proper divisors (7808956773).

21102002331 is a wasteful number, since it uses less digits than its factorization.

21102002331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918370.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21102002331 its reverse (13320020112), we get a palindrome (34422022443).

The spelling of 21102002331 in words is "twenty-one billion, one hundred two million, two thousand, three hundred thirty-one".