21304001334 has 128 divisors (see below), whose sum is σ = 53848571904. Its totient is φ = 5458320000.

The previous prime is 21304001309. The next prime is 21304001353. The reversal of 21304001334 is 43310040312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21304001334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11205784 + ... + 11207684.

It is an arithmetic number, because the mean of its divisors is an integer number (420691968).

Almost surely, 2^21304001334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21304001334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26924285952).

21304001334 is an abundant number, since it is smaller than the sum of its proper divisors (32544570570).

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

21304001334 is a wasteful number, since it uses less digits than its factorization.

21304001334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21304001334 its reverse (43310040312), we get a palindrome (64614041646).

The spelling of 21304001334 in words is "twenty-one billion, three hundred four million, one thousand, three hundred thirty-four".