221064210 has 96 divisors (see below), whose sum is σ = 594397440. Its totient is φ = 56966400.

The previous prime is 221064197. The next prime is 221064223. The reversal of 221064210 is 12460122.

221064210 is a `hidden beast` number, since 2 + 2 + 10 + 642 + 10 = 666.

It is an interprime number because it is at equal distance from previous prime (221064197) and next prime (221064223).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 512695 + ... + 513125.

It is an arithmetic number, because the mean of its divisors is an integer number (6191640).

Almost surely, 2^221064210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221064210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297198720).

221064210 is an abundant number, since it is smaller than the sum of its proper divisors (373333230).

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

221064210 is a wasteful number, since it uses less digits than its factorization.

221064210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 221064210 is about 14868.2282064811. The cubic root of 221064210 is about 604.6529074817.

The spelling of 221064210 in words is "two hundred twenty-one million, sixty-four thousand, two hundred ten".