267210561721 has 2 divisors, whose sum is σ = 267210561722. Its totient is φ = 267210561720.

The previous prime is 267210561691. The next prime is 267210561731. The reversal of 267210561721 is 127165012762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164803521600 + 102407040121 = 405960^2 + 320011^2 .

It is a cyclic number.

It is not a de Polignac number, because 267210561721 - 2¹³ = 267210553529 is a prime.

It is not a weakly prime, because it can be changed into another prime (267210561731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133605280860 + 133605280861.

It is an arithmetic number, because the mean of its divisors is an integer number (133605280861).

Almost surely, 2^267210561721 is an apocalyptic number.

It is an amenable number.

267210561721 is a deficient number, since it is larger than the sum of its proper divisors (1).

267210561721 is an equidigital number, since it uses as much as digits as its factorization.

267210561721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 267210561721 in words is "two hundred sixty-seven billion, two hundred ten million, five hundred sixty-one thousand, seven hundred twenty-one".