21002113410 has 32 divisors (see below), whose sum is σ = 53057972160. Its totient is φ = 5305796928.

The previous prime is 21002113397. The next prime is 21002113427. The reversal of 21002113410 is 1431120012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002113410.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18422337 + ... + 18423476.

It is an arithmetic number, because the mean of its divisors is an integer number (1658061630).

Almost surely, 2^21002113410 is an apocalyptic number.

21002113410 is an abundant number, since it is smaller than the sum of its proper divisors (32055858750).

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

21002113410 is a wasteful number, since it uses less digits than its factorization.

21002113410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36845842.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21002113410 its reverse (1431120012), we get a palindrome (22433233422).

The spelling of 21002113410 in words is "twenty-one billion, two million, one hundred thirteen thousand, four hundred ten".