221402345 has 8 divisors (see below), whose sum is σ = 279666240. Its totient is φ = 167799600.

The previous prime is 221402329. The next prime is 221402381. The reversal of 221402345 is 543204122.

It is a happy number.

221402345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221402345 - 2⁴ = 221402329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221402345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165181 + ... + 1165370.

It is an arithmetic number, because the mean of its divisors is an integer number (34958280).

Almost surely, 2^221402345 is an apocalyptic number.

It is an amenable number.

221402345 is a deficient number, since it is larger than the sum of its proper divisors (58263895).

221402345 is a wasteful number, since it uses less digits than its factorization.

221402345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330575.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 221402345 is about 14879.5949205615. The cubic root of 221402345 is about 604.9610384035.

Adding to 221402345 its reverse (543204122), we get a palindrome (764606467).

The spelling of 221402345 in words is "two hundred twenty-one million, four hundred two thousand, three hundred forty-five".