221621889489280 has 512 divisors, whose sum is σ = 662475977856000. Its totient is φ = 69173637120000.

The previous prime is 221621889489277. The next prime is 221621889489281. The reversal of 221621889489280 is 82984988126122.

221621889489280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221621889489281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 520636530 + ... + 521062030.

It is an arithmetic number, because the mean of its divisors is an integer number (1293898394250).

Almost surely, 2^{221621889489280} is an apocalyptic number.

221621889489280 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 221621889489280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331237988928000).

221621889489280 is an abundant number, since it is smaller than the sum of its proper divisors (440854088366720).

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

221621889489280 is a wasteful number, since it uses less digits than its factorization.

221621889489280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425786 (or 425774 counting only the distinct ones).

The product of its (nonzero) digits is 127401984, while the sum is 70.

The spelling of 221621889489280 in words is "two hundred twenty-one trillion, six hundred twenty-one billion, eight hundred eighty-nine million, four hundred eighty-nine thousand, two hundred eighty".