21534632590 has 16 divisors (see below), whose sum is σ = 38978891280. Its totient is φ = 8565730240.

The previous prime is 21534632549. The next prime is 21534632597. The reversal of 21534632590 is 9523643512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534632597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6013471 + ... + 6017050.

It is an arithmetic number, because the mean of its divisors is an integer number (2436180705).

Almost surely, 2^21534632590 is an apocalyptic number.

21534632590 is a deficient number, since it is larger than the sum of its proper divisors (17444258690).

21534632590 is a wasteful number, since it uses less digits than its factorization.

21534632590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030707.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 21534632590 in words is "twenty-one billion, five hundred thirty-four million, six hundred thirty-two thousand, five hundred ninety".