221323007 has 2 divisors, whose sum is σ = 221323008. Its totient is φ = 221323006.

The previous prime is 221322989. The next prime is 221323009. The reversal of 221323007 is 700323122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221323007 - 2²⁶ = 154214143 is a prime.

Together with 221323009, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221323007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221323009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661503 + 110661504.

It is an arithmetic number, because the mean of its divisors is an integer number (110661504).

Almost surely, 2^221323007 is an apocalyptic number.

221323007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323007 is an equidigital number, since it uses as much as digits as its factorization.

221323007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 221323007 is about 14876.9286816870. The cubic root of 221323007 is about 604.8887685681. Note that the first 3 decimals are identical.

Adding to 221323007 its reverse (700323122), we get a palindrome (921646129).

The spelling of 221323007 in words is "two hundred twenty-one million, three hundred twenty-three thousand, seven".