21002103231 has 16 divisors (see below), whose sum is σ = 28965055488. Its totient is φ = 13522118400.

The previous prime is 21002103223. The next prime is 21002103271. The reversal of 21002103231 is 13230120012.

It is not a de Polignac number, because 21002103231 - 2³ = 21002103223 is a prime.

It is a super-2 number, since 2×21002103231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21002103231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002103271) 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, 184306 + ... + 275631.

It is an arithmetic number, because the mean of its divisors is an integer number (1810315968).

Almost surely, 2^21002103231 is an apocalyptic number.

21002103231 is a deficient number, since it is larger than the sum of its proper divisors (7962952257).

21002103231 is a wasteful number, since it uses less digits than its factorization.

21002103231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460462.

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

Adding to 21002103231 its reverse (13230120012), we get a palindrome (34232223243).

The spelling of 21002103231 in words is "twenty-one billion, two million, one hundred three thousand, two hundred thirty-one".