2116645301621 has 8 divisors (see below), whose sum is σ = 2123603143200. Its totient is φ = 2109687871248.

The previous prime is 2116645301581. The next prime is 2116645301657. The reversal of 2116645301621 is 1261035466112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2116645301621 - 2³⁰ = 2115571559797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116645301821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12904295 + ... + 13067291.

It is an arithmetic number, because the mean of its divisors is an integer number (265450392900).

Almost surely, 2^{2116645301621} is an apocalyptic number.

It is an amenable number.

2116645301621 is a deficient number, since it is larger than the sum of its proper divisors (6957841579).

2116645301621 is a wasteful number, since it uses less digits than its factorization.

2116645301621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205603.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 2116645301621 in words is "two trillion, one hundred sixteen billion, six hundred forty-five million, three hundred one thousand, six hundred twenty-one".