221352870 has 32 divisors (see below), whose sum is σ = 545607648. Its totient is φ = 57431808.

The previous prime is 221352847. The next prime is 221352877. The reversal of 221352870 is 78253122.

221352870 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 (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221352877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98599 + ... + 100818.

It is an arithmetic number, because the mean of its divisors is an integer number (17050239).

Almost surely, 2^221352870 is an apocalyptic number.

221352870 is an abundant number, since it is smaller than the sum of its proper divisors (324254778).

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

221352870 is a wasteful number, since it uses less digits than its factorization.

221352870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199464.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 221352870 is about 14877.9323160176. The cubic root of 221352870 is about 604.9159731218.

It can be divided in two parts, 221352 and 870, that added together give a palindrome (222222).

The spelling of 221352870 in words is "two hundred twenty-one million, three hundred fifty-two thousand, eight hundred seventy".