221358870 has 96 divisors (see below), whose sum is σ = 614109600. Its totient is φ = 55127040.

The previous prime is 221358859. The next prime is 221358937. The reversal of 221358870 is 78853122.

221358870 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 588 + 70 = 666.

221358870 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 227485 + ... + 228455.

It is an arithmetic number, because the mean of its divisors is an integer number (6396975).

Almost surely, 2^221358870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221358870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307054800).

221358870 is an abundant number, since it is smaller than the sum of its proper divisors (392750730).

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

221358870 is a wasteful number, since it uses less digits than its factorization.

221358870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 221358870 is about 14878.1339555739. The cubic root of 221358870 is about 604.9214386982.

The spelling of 221358870 in words is "two hundred twenty-one million, three hundred fifty-eight thousand, eight hundred seventy".