221164345 has 16 divisors (see below), whose sum is σ = 271321920. Its totient is φ = 173016000.

The previous prime is 221164331. The next prime is 221164357. The reversal of 221164345 is 543461122.

It is not a de Polignac number, because 221164345 - 2¹¹ = 221162297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52570 + ... + 56620.

It is an arithmetic number, because the mean of its divisors is an integer number (16957620).

Almost surely, 2^221164345 is an apocalyptic number.

It is an amenable number.

221164345 is a deficient number, since it is larger than the sum of its proper divisors (50157575).

221164345 is a wasteful number, since it uses less digits than its factorization.

221164345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296.

The product of its digits is 5760, while the sum is 28.

The square root of 221164345 is about 14871.5952405920. The cubic root of 221164345 is about 604.7441898279.

The spelling of 221164345 in words is "two hundred twenty-one million, one hundred sixty-four thousand, three hundred forty-five".