21549936823074 has 40 divisors (see below), whose sum is σ = 52677623349648. Its totient is φ = 6530283885240.

The previous prime is 21549936823049. The next prime is 21549936823279. The reversal of 21549936823074 is 47032863994512.

21549936823074 is a `hidden beast` number, since 2 + 1 + 5 + 499 + 36 + 82 + 30 + 7 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6046557372 + ... + 6046560935.

It is a 1-persistent number, because it is pandigital, but 2⋅21549936823074 = 43099873646148 is not.

Almost surely, 2^{21549936823074} is an apocalyptic number.

21549936823074 is an abundant number, since it is smaller than the sum of its proper divisors (31127686526574).

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

21549936823074 is a wasteful number, since it uses less digits than its factorization.

21549936823074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12093118332 (or 12093118323 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 63.

The spelling of 21549936823074 in words is "twenty-one trillion, five hundred forty-nine billion, nine hundred thirty-six million, eight hundred twenty-three thousand, seventy-four".