221294487064 has 64 divisors (see below), whose sum is σ = 481565468160. Its totient is φ = 93369576960.

The previous prime is 221294487059. The next prime is 221294487101. The reversal of 221294487064 is 460784492122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221294486999 and 221294487017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6650709 + ... + 6683899.

It is an arithmetic number, because the mean of its divisors is an integer number (7524460440).

Almost surely, 2^221294487064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221294487064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240782734080).

221294487064 is an abundant number, since it is smaller than the sum of its proper divisors (260270981096).

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

221294487064 is a wasteful number, since it uses less digits than its factorization.

221294487064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35048 (or 35044 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 221294487064 in words is "two hundred twenty-one billion, two hundred ninety-four million, four hundred eighty-seven thousand, sixty-four".