221479825560 has 384 divisors, whose sum is σ = 786480710400. Its totient is φ = 49743590400.

The previous prime is 221479825543. The next prime is 221479825571. The reversal of 221479825560 is 65528974122.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 82547979 + ... + 82550661.

It is an arithmetic number, because the mean of its divisors is an integer number (2048126850).

Almost surely, 2^221479825560 is an apocalyptic number.

221479825560 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 221479825560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393240355200).

221479825560 is an abundant number, since it is smaller than the sum of its proper divisors (565000884840).

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

221479825560 is a wasteful number, since it uses less digits than its factorization.

221479825560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951 (or 2940 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 221479825560 in words is "two hundred twenty-one billion, four hundred seventy-nine million, eight hundred twenty-five thousand, five hundred sixty".