2721121177261 has 2 divisors, whose sum is σ = 2721121177262. Its totient is φ = 2721121177260.

The previous prime is 2721121177219. The next prime is 2721121177289. The reversal of 2721121177261 is 1627711211272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1540530274761 + 1180590902500 = 1241181^2 + 1086550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721121177261 - 2¹⁹ = 2721120652973 is a prime.

It is a super-2 number, since 2×2721121177261² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2721121117261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360560588630 + 1360560588631.

It is an arithmetic number, because the mean of its divisors is an integer number (1360560588631).

Almost surely, 2^{2721121177261} is an apocalyptic number.

It is an amenable number.

2721121177261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721121177261 is an equidigital number, since it uses as much as digits as its factorization.

2721121177261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928, while the sum is 40.

The spelling of 2721121177261 in words is "two trillion, seven hundred twenty-one billion, one hundred twenty-one million, one hundred seventy-seven thousand, two hundred sixty-one".