221428210 has 16 divisors (see below), whose sum is σ = 400660992. Its totient is φ = 88106800.

The previous prime is 221428189. The next prime is 221428211. The reversal of 221428210 is 12824122.

It is not an unprimeable number, because it can be changed into a prime (221428211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56056 + ... + 59875.

It is an arithmetic number, because the mean of its divisors is an integer number (25041312).

Almost surely, 2^221428210 is an apocalyptic number.

221428210 is a deficient number, since it is larger than the sum of its proper divisors (179232782).

221428210 is a wasteful number, since it uses less digits than its factorization.

221428210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116129.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 221428210 is about 14880.4640384633. The cubic root of 221428210 is about 604.9845953776.

The spelling of 221428210 in words is "two hundred twenty-one million, four hundred twenty-eight thousand, two hundred ten".