2215721272761 has 8 divisors (see below), whose sum is σ = 3282550033760. Its totient is φ = 1477147515156.

The previous prime is 2215721272747. The next prime is 2215721272811. The reversal of 2215721272761 is 1672721275122.

2215721272761 is a `hidden beast` number, since 2 + 2 + 1 + 572 + 1 + 2 + 7 + 2 + 76 + 1 = 666.

It is not a de Polignac number, because 2215721272761 - 2⁹ = 2215721272249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215721272711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41031875395 + ... + 41031875448.

It is an arithmetic number, because the mean of its divisors is an integer number (410318754220).

Almost surely, 2^{2215721272761} is an apocalyptic number.

It is an amenable number.

2215721272761 is a deficient number, since it is larger than the sum of its proper divisors (1066828760999).

2215721272761 is an equidigital number, since it uses as much as digits as its factorization.

2215721272761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82063750852 (or 82063750846 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The spelling of 2215721272761 in words is "two trillion, two hundred fifteen billion, seven hundred twenty-one million, two hundred seventy-two thousand, seven hundred sixty-one".