221066707 has 4 divisors (see below), whose sum is σ = 221174920. Its totient is φ = 220958496.

The previous prime is 221066693. The next prime is 221066717. The reversal of 221066707 is 707660122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221066707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221066717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50982 + ... + 55147.

It is an arithmetic number, because the mean of its divisors is an integer number (55293730).

Almost surely, 2^221066707 is an apocalyptic number.

221066707 is a deficient number, since it is larger than the sum of its proper divisors (108213).

221066707 is a wasteful number, since it uses less digits than its factorization.

221066707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108212.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 221066707 is about 14868.3121772446. The cubic root of 221066707 is about 604.6551840640.

The spelling of 221066707 in words is "two hundred twenty-one million, sixty-six thousand, seven hundred seven".