21959604253 has 8 divisors (see below), whose sum is σ = 22669149888. Its totient is φ = 21259097664.

The previous prime is 21959604239. The next prime is 21959604263. The reversal of 21959604253 is 35240695912.

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

It is a cyclic number.

It is not a de Polignac number, because 21959604253 - 2⁹ = 21959603741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21959604263) 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, 2254825 + ... + 2264542.

It is an arithmetic number, because the mean of its divisors is an integer number (2833643736).

Almost surely, 2^21959604253 is an apocalyptic number.

It is an amenable number.

21959604253 is a deficient number, since it is larger than the sum of its proper divisors (709545635).

21959604253 is a wasteful number, since it uses less digits than its factorization.

21959604253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519523.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 21959604253 in words is "twenty-one billion, nine hundred fifty-nine million, six hundred four thousand, two hundred fifty-three".