273785532209221 has 2 divisors, whose sum is σ = 273785532209222. Its totient is φ = 273785532209220.

The previous prime is 273785532209213. The next prime is 273785532209389. The reversal of 273785532209221 is 122902235587372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228089432916900 + 45696099292321 = 15102630^2 + 6759889^2 .

It is a cyclic number.

It is not a de Polignac number, because 273785532209221 - 2³ = 273785532209213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (273785532200221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136892766104610 + 136892766104611.

It is an arithmetic number, because the mean of its divisors is an integer number (136892766104611).

Almost surely, 2^{273785532209221} is an apocalyptic number.

It is an amenable number.

273785532209221 is a deficient number, since it is larger than the sum of its proper divisors (1).

273785532209221 is an equidigital number, since it uses as much as digits as its factorization.

273785532209221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 273785532209221 in words is "two hundred seventy-three trillion, seven hundred eighty-five billion, five hundred thirty-two million, two hundred nine thousand, two hundred twenty-one".