216121464364405 has 8 divisors (see below), whose sum is σ = 259691091139584. Its totient is φ = 172666948890000.

The previous prime is 216121464364321. The next prime is 216121464364409. The reversal of 216121464364405 is 504463464121612.

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

It is not a de Polignac number, because 216121464364405 - 2³¹ = 216119316880757 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 (216121464364409) 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, 28777821061 + ... + 28777828570.

It is an arithmetic number, because the mean of its divisors is an integer number (32461386392448).

Almost surely, 2^{216121464364405} is an apocalyptic number.

It is an amenable number.

216121464364405 is a deficient number, since it is larger than the sum of its proper divisors (43569626775179).

216121464364405 is an equidigital number, since it uses as much as digits as its factorization.

216121464364405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57555650387.

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 216121464364405 in words is "two hundred sixteen trillion, one hundred twenty-one billion, four hundred sixty-four million, three hundred sixty-four thousand, four hundred five".