21223535654563 has 8 divisors (see below), whose sum is σ = 23470111658736. Its totient is φ = 19029820262400.

The previous prime is 21223535654551. The next prime is 21223535654597. The reversal of 21223535654563 is 36545653532212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223535654563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223535654563.

It is not an unprimeable number, because it can be changed into a prime (21223535624563) 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, 13215152158 + ... + 13215153763.

It is an arithmetic number, because the mean of its divisors is an integer number (2933763957342).

Almost surely, 2^{21223535654563} is an apocalyptic number.

21223535654563 is a deficient number, since it is larger than the sum of its proper divisors (2246576004173).

21223535654563 is a wasteful number, since it uses less digits than its factorization.

21223535654563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26430306005.

The product of its digits is 19440000, while the sum is 52.

The spelling of 21223535654563 in words is "twenty-one trillion, two hundred twenty-three billion, five hundred thirty-five million, six hundred fifty-four thousand, five hundred sixty-three".