21103231002 has 64 divisors (see below), whose sum is σ = 49388258304. Its totient is φ = 5885631360.

The previous prime is 21103230989. The next prime is 21103231007. The reversal of 21103231002 is 20013230112.

21103231002 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21103231007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4406053 + ... + 4410839.

It is an arithmetic number, because the mean of its divisors is an integer number (771691536).

Almost surely, 2^21103231002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103231002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24694129152).

21103231002 is an abundant number, since it is smaller than the sum of its proper divisors (28285027302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103231002 is a wasteful number, since it uses less digits than its factorization.

21103231002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283.

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

Adding to 21103231002 its reverse (20013230112), we get a palindrome (41116461114).

The spelling of 21103231002 in words is "twenty-one billion, one hundred three million, two hundred thirty-one thousand, two".