221534404134737 has 2 divisors, whose sum is σ = 221534404134738. Its totient is φ = 221534404134736.

The previous prime is 221534404134677. The next prime is 221534404134781. The reversal of 221534404134737 is 737431404435122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195461901831361 + 26072502303376 = 13980769^2 + 5106124^2 .

It is a cyclic number.

It is not a de Polignac number, because 221534404134737 - 2³⁴ = 221517224265553 is a prime.

It is not a weakly prime, because it can be changed into another prime (221534484134737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767202067368 + 110767202067369.

It is an arithmetic number, because the mean of its divisors is an integer number (110767202067369).

Almost surely, 2^{221534404134737} is an apocalyptic number.

It is an amenable number.

221534404134737 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534404134737 is an equidigital number, since it uses as much as digits as its factorization.

221534404134737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 50.

Adding to 221534404134737 its reverse (737431404435122), we get a palindrome (958965808569859).

The spelling of 221534404134737 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred four million, one hundred thirty-four thousand, seven hundred thirty-seven".