21624223260545 has 8 divisors (see below), whose sum is σ = 25949263657320. Its totient is φ = 17299248112000.

The previous prime is 21624223260487. The next prime is 21624223260551. The reversal of 21624223260545 is 54506232242612.

It can be written as a sum of positive squares in 4 ways, for example, as 547456449409 + 21076766811136 = 739903^2 + 4590944^2 .

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

It is not a de Polignac number, because 21624223260545 - 2³⁰ = 21623149518721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21624223260496 and 21624223260505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15579956 + ... + 16911045.

It is an arithmetic number, because the mean of its divisors is an integer number (3243657957165).

Almost surely, 2^{21624223260545} is an apocalyptic number.

It is an amenable number.

21624223260545 is a deficient number, since it is larger than the sum of its proper divisors (4325040396775).

21624223260545 is a wasteful number, since it uses less digits than its factorization.

21624223260545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32624115.

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 21624223260545 in words is "twenty-one trillion, six hundred twenty-four billion, two hundred twenty-three million, two hundred sixty thousand, five hundred forty-five".