21603266545 has 16 divisors (see below), whose sum is σ = 31370122368. Its totient is φ = 13942275840.

The previous prime is 21603266539. The next prime is 21603266569. The reversal of 21603266545 is 54566230612.

It is a happy number.

It is not a de Polignac number, because 21603266545 - 2⁹ = 21603266033 is a prime.

It is a super-2 number, since 2×21603266545² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21603266498 and 21603266507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18153411 + ... + 18154600.

It is an arithmetic number, because the mean of its divisors is an integer number (1960632648).

Almost surely, 2^21603266545 is an apocalyptic number.

It is an amenable number.

21603266545 is a deficient number, since it is larger than the sum of its proper divisors (9766855823).

21603266545 is a wasteful number, since it uses less digits than its factorization.

21603266545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36308040.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 21603266545 in words is "twenty-one billion, six hundred three million, two hundred sixty-six thousand, five hundred forty-five".