21066774435364 has 24 divisors (see below), whose sum is σ = 42136512436928. Its totient is φ = 9027982565280.

The previous prime is 21066774435307. The next prime is 21066774435389. The reversal of 21066774435364 is 46353447766012.

It is a happy number.

It is a super-2 number, since 2×21066774435364² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21066774435299 and 21066774435308.

It is an unprimeable number.

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, 26055114 + ... + 26851489.

Almost surely, 2^{21066774435364} is an apocalyptic number.

It is an amenable number.

21066774435364 is an abundant number, since it is smaller than the sum of its proper divisors (21069738001564).

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

21066774435364 is a wasteful number, since it uses less digits than its factorization.

21066774435364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52920835 (or 52920833 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 58.

The spelling of 21066774435364 in words is "twenty-one trillion, sixty-six billion, seven hundred seventy-four million, four hundred thirty-five thousand, three hundred sixty-four".