221220007 has 2 divisors, whose sum is σ = 221220008. Its totient is φ = 221220006.

The previous prime is 221219989. The next prime is 221220037. The reversal of 221220007 is 700022122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221220007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610003 + 110610004.

It is an arithmetic number, because the mean of its divisors is an integer number (110610004).

Almost surely, 2^221220007 is an apocalyptic number.

221220007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220007 is an equidigital number, since it uses as much as digits as its factorization.

221220007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 221220007 is about 14873.4665428070. The cubic root of 221220007 is about 604.7949189927.

Adding to 221220007 its reverse (700022122), we get a palindrome (921242129).

The spelling of 221220007 in words is "two hundred twenty-one million, two hundred twenty thousand, seven".