21026656353 has 8 divisors (see below), whose sum is σ = 28390422400. Its totient is φ = 13840330608.

The previous prime is 21026656307. The next prime is 21026656361. The reversal of 21026656353 is 35365662012.

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

It is not a de Polignac number, because 21026656353 - 2²⁸ = 20758220897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21026656303) 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, 44359798 + ... + 44360271.

It is an arithmetic number, because the mean of its divisors is an integer number (3548802800).

Almost surely, 2^21026656353 is an apocalyptic number.

It is an amenable number.

21026656353 is a deficient number, since it is larger than the sum of its proper divisors (7363766047).

21026656353 is an equidigital number, since it uses as much as digits as its factorization.

21026656353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88720151.

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 21026656353 in words is "twenty-one billion, twenty-six million, six hundred fifty-six thousand, three hundred fifty-three".