21004402314 has 64 divisors (see below), whose sum is σ = 49038022656. Its totient is φ = 5873909184.

The previous prime is 21004402273. The next prime is 21004402333. The reversal of 21004402314 is 41320440012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 418027 + ... + 465569.

It is an arithmetic number, because the mean of its divisors is an integer number (766219104).

Almost surely, 2^21004402314 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21004402314, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24519011328).

21004402314 is an abundant number, since it is smaller than the sum of its proper divisors (28033620342).

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

21004402314 is a wasteful number, since it uses less digits than its factorization.

21004402314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47779.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21004402314 its reverse (41320440012), we get a palindrome (62324842326).

The spelling of 21004402314 in words is "twenty-one billion, four million, four hundred two thousand, three hundred fourteen".