21002100231 has 16 divisors (see below), whose sum is σ = 32013593600. Its totient is φ = 11997302688.

The previous prime is 21002100221. The next prime is 21002100269. The reversal of 21002100231 is 13200120012.

It is not a de Polignac number, because 21002100231 - 2⁵ = 21002100199 is a prime.

It is a super-2 number, since 2×21002100231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002100221) 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, 95551 + ... + 226128.

It is an arithmetic number, because the mean of its divisors is an integer number (2000849600).

Almost surely, 2^21002100231 is an apocalyptic number.

21002100231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21002100231 is a deficient number, since it is larger than the sum of its proper divisors (11011493369).

21002100231 is a wasteful number, since it uses less digits than its factorization.

21002100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324798.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21002100231 its reverse (13200120012), we get a palindrome (34202220243).

The spelling of 21002100231 in words is "twenty-one billion, two million, one hundred thousand, two hundred thirty-one".