21545563362606 has 96 divisors (see below), whose sum is σ = 47206399339008. Its totient is φ = 7101450021120.

The previous prime is 21545563362593. The next prime is 21545563362677. The reversal of 21545563362606 is 60626336554512.

It is a happy number.

21545563362606 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 5 + 5 + 6 + 3 + 3 + 626 + 0 + 6 = 666.

It is a super-2 number, since 2×21545563362606² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2724868105 + ... + 2724876011.

It is an arithmetic number, because the mean of its divisors is an integer number (491733326448).

Almost surely, 2^{21545563362606} is an apocalyptic number.

21545563362606 is an abundant number, since it is smaller than the sum of its proper divisors (25660835976402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21545563362606 is a wasteful number, since it uses less digits than its factorization.

21545563362606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486 (or 10483 counting only the distinct ones).

The product of its (nonzero) digits is 23328000, while the sum is 54.

The spelling of 21545563362606 in words is "twenty-one trillion, five hundred forty-five billion, five hundred sixty-three million, three hundred sixty-two thousand, six hundred six".