221401242437 has 2 divisors, whose sum is σ = 221401242438. Its totient is φ = 221401242436.

The previous prime is 221401242421. The next prime is 221401242443. The reversal of 221401242437 is 734242104122.

221401242437 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., 221300621476 + 100620961 = 470426^2 + 10031^2 .

It is a cyclic number.

It is not a de Polignac number, because 221401242437 - 2⁴ = 221401242421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221401245437) 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, 110700621218 + 110700621219.

It is an arithmetic number, because the mean of its divisors is an integer number (110700621219).

Almost surely, 2^221401242437 is an apocalyptic number.

It is an amenable number.

221401242437 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401242437 is an equidigital number, since it uses as much as digits as its factorization.

221401242437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

Adding to 221401242437 its reverse (734242104122), we get a palindrome (955643346559).

The spelling of 221401242437 in words is "two hundred twenty-one billion, four hundred one million, two hundred forty-two thousand, four hundred thirty-seven".