21660550264245 has 32 divisors (see below), whose sum is σ = 34769012834304. Its totient is φ = 11514930926400.

The previous prime is 21660550264219. The next prime is 21660550264247. The reversal of 21660550264245 is 54246205506612.

It is not a de Polignac number, because 21660550264245 - 2⁹ = 21660550263733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21660550264194 and 21660550264203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660550264247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22886580 + ... + 23814210.

It is an arithmetic number, because the mean of its divisors is an integer number (1086531651072).

Almost surely, 2^{21660550264245} is an apocalyptic number.

It is an amenable number.

21660550264245 is a deficient number, since it is larger than the sum of its proper divisors (13108462570059).

21660550264245 is a wasteful number, since it uses less digits than its factorization.

21660550264245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932673.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 21660550264245 in words is "twenty-one trillion, six hundred sixty billion, five hundred fifty million, two hundred sixty-four thousand, two hundred forty-five".