221211018013957 has 2 divisors, whose sum is σ = 221211018013958. Its totient is φ = 221211018013956.

The previous prime is 221211018013891. The next prime is 221211018014039. The reversal of 221211018013957 is 759310810112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214386729086401 + 6824288927556 = 14641951^2 + 2612334^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211018013957 - 2¹⁵ = 221211017981189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211010013957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605509006978 + 110605509006979.

It is an arithmetic number, because the mean of its divisors is an integer number (110605509006979).

Almost surely, 2^{221211018013957} is an apocalyptic number.

It is an amenable number.

221211018013957 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211018013957 is an equidigital number, since it uses as much as digits as its factorization.

221211018013957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 43.

The spelling of 221211018013957 in words is "two hundred twenty-one trillion, two hundred eleven billion, eighteen million, thirteen thousand, nine hundred fifty-seven".