221400667 has 4 divisors (see below), whose sum is σ = 228542656. Its totient is φ = 214258680.

The previous prime is 221400653. The next prime is 221400671. The reversal of 221400667 is 766004122.

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

It is a cyclic number.

It is not a de Polignac number, because 221400667 - 2²⁷ = 87182939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221400607) 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, 3570948 + ... + 3571009.

It is an arithmetic number, because the mean of its divisors is an integer number (57135664).

Almost surely, 2^221400667 is an apocalyptic number.

221400667 is a deficient number, since it is larger than the sum of its proper divisors (7141989).

221400667 is an equidigital number, since it uses as much as digits as its factorization.

221400667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141988.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 221400667 is about 14879.5385345111. The cubic root of 221400667 is about 604.9595100740.

Adding to 221400667 its reverse (766004122), we get a palindrome (987404789).

The spelling of 221400667 in words is "two hundred twenty-one million, four hundred thousand, six hundred sixty-seven".