21275545643184 has 80 divisors (see below), whose sum is σ = 62870776155648. Its totient is φ = 6073185993216.

The previous prime is 21275545643123. The next prime is 21275545643189. The reversal of 21275545643184 is 48134654557212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21275545643189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28491972 + ... + 29229155.

Almost surely, 2^{21275545643184} is an apocalyptic number.

21275545643184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21275545643184 is an abundant number, since it is smaller than the sum of its proper divisors (41595230512464).

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

21275545643184 is a wasteful number, since it uses less digits than its factorization.

21275545643184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57722242 (or 57722236 counting only the distinct ones).

The product of its digits is 32256000, while the sum is 57.

The spelling of 21275545643184 in words is "twenty-one trillion, two hundred seventy-five billion, five hundred forty-five million, six hundred forty-three thousand, one hundred eighty-four".