221211438907 has 2 divisors, whose sum is σ = 221211438908. Its totient is φ = 221211438906.

The previous prime is 221211438901. The next prime is 221211438923. The reversal of 221211438907 is 709834112122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211438907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211438907.

It is not a weakly prime, because it can be changed into another prime (221211438901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605719453 + 110605719454.

It is an arithmetic number, because the mean of its divisors is an integer number (110605719454).

Almost surely, 2^221211438907 is an apocalyptic number.

221211438907 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211438907 is an equidigital number, since it uses as much as digits as its factorization.

221211438907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 221211438907 in words is "two hundred twenty-one billion, two hundred eleven million, four hundred thirty-eight thousand, nine hundred seven".