221221012007 has 2 divisors, whose sum is σ = 221221012008. Its totient is φ = 221221012006.

The previous prime is 221221011989. The next prime is 221221012009. The reversal of 221221012007 is 700210122122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221012007 is a prime.

Together with 221221012009, 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 221221012007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221012009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610506003 + 110610506004.

It is an arithmetic number, because the mean of its divisors is an integer number (110610506004).

Almost surely, 2^221221012007 is an apocalyptic number.

221221012007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221012007 is an equidigital number, since it uses as much as digits as its factorization.

221221012007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 221221012007 its reverse (700210122122), we get a palindrome (921431134129).

The spelling of 221221012007 in words is "two hundred twenty-one billion, two hundred twenty-one million, twelve thousand, seven".