21554560773000 has 384 divisors, whose sum is σ = 77769026899200. Its totient is φ = 5368664448000.

The previous prime is 21554560772977. The next prime is 21554560773007. The reversal of 21554560773000 is 37706545512.

It is a happy number.

21554560773000 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 4 + 5 + 607 + 7 + 30 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21554560773007) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11253324 + ... + 13028676.

It is an arithmetic number, because the mean of its divisors is an integer number (202523507550).

Almost surely, 2^{21554560773000} is an apocalyptic number.

21554560773000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21554560773000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38884513449600).

21554560773000 is an abundant number, since it is smaller than the sum of its proper divisors (56214466126200).

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

21554560773000 is a wasteful number, since it uses less digits than its factorization.

21554560773000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775470 (or 1775453 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 21554560773000 in words is "twenty-one trillion, five hundred fifty-four billion, five hundred sixty million, seven hundred seventy-three thousand".