21104134450 has 24 divisors (see below), whose sum is σ = 44861360832. Its totient is φ = 7235703120.

The previous prime is 21104134421. The next prime is 21104134451. The reversal of 21104134450 is 5443140112.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21104134451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30148414 + ... + 30149113.

It is an arithmetic number, because the mean of its divisors is an integer number (1869223368).

Almost surely, 2^21104134450 is an apocalyptic number.

21104134450 is an abundant number, since it is smaller than the sum of its proper divisors (23757226382).

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

21104134450 is a wasteful number, since it uses less digits than its factorization.

21104134450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60297546 (or 60297541 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21104134450 its reverse (5443140112), we get a palindrome (26547274562).

The spelling of 21104134450 in words is "twenty-one billion, one hundred four million, one hundred thirty-four thousand, four hundred fifty".