2116545220721 has 16 divisors (see below), whose sum is σ = 2134263398400. Its totient is φ = 2098917551808.

The previous prime is 2116545220687. The next prime is 2116545220723. The reversal of 2116545220721 is 1270225456112.

It is a cyclic number.

It is not a de Polignac number, because 2116545220721 - 2¹⁴ = 2116545204337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116545220723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59039120 + ... + 59074958.

It is an arithmetic number, because the mean of its divisors is an integer number (133391462400).

Almost surely, 2^{2116545220721} is an apocalyptic number.

It is an amenable number.

2116545220721 is a deficient number, since it is larger than the sum of its proper divisors (17718177679).

2116545220721 is a wasteful number, since it uses less digits than its factorization.

2116545220721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37088.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 2116545220721 in words is "two trillion, one hundred sixteen billion, five hundred forty-five million, two hundred twenty thousand, seven hundred twenty-one".