21204202594 has 8 divisors (see below), whose sum is σ = 31817445228. Its totient is φ = 10598387520.

The previous prime is 21204202583. The next prime is 21204202601. The reversal of 21204202594 is 49520240212.

It can be written as a sum of positive squares in 2 ways, for example, as 21181018369 + 23184225 = 145537^2 + 4815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849747 + ... + 1861174.

Almost surely, 2^21204202594 is an apocalyptic number.

21204202594 is a deficient number, since it is larger than the sum of its proper divisors (10613242634).

21204202594 is a wasteful number, since it uses less digits than its factorization.

21204202594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713780.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21204202594 in words is "twenty-one billion, two hundred four million, two hundred two thousand, five hundred ninety-four".