221021094 has 32 divisors (see below), whose sum is σ = 505979136. Its totient is φ = 63050400.

The previous prime is 221021089. The next prime is 221021111. The reversal of 221021094 is 490120122.

It is a super-3 number, since 3×221021094³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221021094.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25689 + ... + 33195.

It is an arithmetic number, because the mean of its divisors is an integer number (15811848).

Almost surely, 2^221021094 is an apocalyptic number.

221021094 is an abundant number, since it is smaller than the sum of its proper divisors (284958042).

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

221021094 is a wasteful number, since it uses less digits than its factorization.

221021094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8220.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 221021094 is about 14866.7781983858. The cubic root of 221021094 is about 604.6135947561.

The spelling of 221021094 in words is "two hundred twenty-one million, twenty-one thousand, ninety-four".