21345794404 has 81 divisors (see below), whose sum is σ = 42710966571. Its totient is φ = 9327151680.

The previous prime is 21345794387. The next prime is 21345794411. The reversal of 21345794404 is 40449754312.

The square root of 21345794404 is 146102.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5730792804 + 15615001600 = 75702^2 + 124960^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 93212962 + ... + 93213190.

Almost surely, 2^21345794404 is an apocalyptic number.

21345794404 is the 146102-nd square number.

It is an amenable number.

21345794404 is an abundant number, since it is smaller than the sum of its proper divisors (21365172167).

21345794404 is a wasteful number, since it uses less digits than its factorization.

21345794404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 21345794404 in words is "twenty-one billion, three hundred forty-five million, seven hundred ninety-four thousand, four hundred four".