21304440474 has 16 divisors (see below), whose sum is σ = 42612251808. Its totient is φ = 7100918352.

The previous prime is 21304440473. The next prime is 21304440539. The reversal of 21304440474 is 47404440312.

It is not an unprimeable number, because it can be changed into a prime (21304440473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54217 + ... + 213420.

It is an arithmetic number, because the mean of its divisors is an integer number (2663265738).

Almost surely, 2^21304440474 is an apocalyptic number.

21304440474 is an abundant number, since it is smaller than the sum of its proper divisors (21307811334).

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

21304440474 is a wasteful number, since it uses less digits than its factorization.

21304440474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280909.

The product of its (nonzero) digits is 43008, while the sum is 33.

Adding to 21304440474 its reverse (47404440312), we get a palindrome (68708880786).

The spelling of 21304440474 in words is "twenty-one billion, three hundred four million, four hundred forty thousand, four hundred seventy-four".