221211044402357 has 2 divisors, whose sum is σ = 221211044402358. Its totient is φ = 221211044402356.

The previous prime is 221211044402297. The next prime is 221211044402363. The reversal of 221211044402357 is 753204440112122.

221211044402357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127467577343716 + 93743467058641 = 11290154^2 + 9682121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211044402357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211044402357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211044402377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605522201178 + 110605522201179.

It is an arithmetic number, because the mean of its divisors is an integer number (110605522201179).

Almost surely, 2^{221211044402357} is an apocalyptic number.

It is an amenable number.

221211044402357 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211044402357 is an equidigital number, since it uses as much as digits as its factorization.

221211044402357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 38.

Adding to 221211044402357 its reverse (753204440112122), we get a palindrome (974415484514479).

The spelling of 221211044402357 in words is "two hundred twenty-one trillion, two hundred eleven billion, forty-four million, four hundred two thousand, three hundred fifty-seven".