21905352590 has 16 divisors (see below), whose sum is σ = 43014147120. Its totient is φ = 7965582720.

The previous prime is 21905352589. The next prime is 21905352611. The reversal of 21905352590 is 9525350912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99569675 + ... + 99569894.

It is an arithmetic number, because the mean of its divisors is an integer number (2688384195).

Almost surely, 2^21905352590 is an apocalyptic number.

21905352590 is a deficient number, since it is larger than the sum of its proper divisors (21108794530).

21905352590 is a wasteful number, since it uses less digits than its factorization.

21905352590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199139587.

The product of its (nonzero) digits is 121500, while the sum is 41.

The spelling of 21905352590 in words is "twenty-one billion, nine hundred five million, three hundred fifty-two thousand, five hundred ninety".