69211074537721 has 2 divisors, whose sum is σ = 69211074537722. Its totient is φ = 69211074537720.

The previous prime is 69211074537637. The next prime is 69211074537749. The reversal of 69211074537721 is 12773547011296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46885024285696 + 22326050252025 = 6847264^2 + 4725045^2 .

It is a cyclic number.

It is not a de Polignac number, because 69211074537721 - 2¹⁵ = 69211074504953 is a prime.

It is not a weakly prime, because it can be changed into another prime (69211074537221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34605537268860 + 34605537268861.

It is an arithmetic number, because the mean of its divisors is an integer number (34605537268861).

Almost surely, 2^{69211074537721} is an apocalyptic number.

It is an amenable number.

69211074537721 is a deficient number, since it is larger than the sum of its proper divisors (1).

69211074537721 is an equidigital number, since it uses as much as digits as its factorization.

69211074537721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 69211074537721 in words is "sixty-nine trillion, two hundred eleven billion, seventy-four million, five hundred thirty-seven thousand, seven hundred twenty-one".