21632421473653 has 8 divisors (see below), whose sum is σ = 22541712790680. Its totient is φ = 20734019873280.

The previous prime is 21632421473629. The next prime is 21632421473693. The reversal of 21632421473653 is 35637412423612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11280617147569 + 10351804326084 = 3358663^2 + 3217422^2 .

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-21632421473653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21632421473597 and 21632421473606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632421473693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2722425108 + ... + 2722433053.

It is an arithmetic number, because the mean of its divisors is an integer number (2817714098835).

Almost surely, 2^{21632421473653} is an apocalyptic number.

It is an amenable number.

21632421473653 is a deficient number, since it is larger than the sum of its proper divisors (909291317027).

21632421473653 is a wasteful number, since it uses less digits than its factorization.

21632421473653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444858327.

The product of its digits is 4354560, while the sum is 49.

The spelling of 21632421473653 in words is "twenty-one trillion, six hundred thirty-two billion, four hundred twenty-one million, four hundred seventy-three thousand, six hundred fifty-three".