216355055021 has 32 divisors (see below), whose sum is σ = 269456424960. Its totient is φ = 169592973696.

The previous prime is 216355055017. The next prime is 216355055023. The reversal of 216355055021 is 120550553612.

It is not a de Polignac number, because 216355055021 - 2² = 216355055017 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 (216355055023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219260 + ... + 693386.

It is an arithmetic number, because the mean of its divisors is an integer number (8420513280).

Almost surely, 2^216355055021 is an apocalyptic number.

It is an amenable number.

216355055021 is a deficient number, since it is larger than the sum of its proper divisors (53101369939).

216355055021 is a wasteful number, since it uses less digits than its factorization.

216355055021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474273.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 216355055021 in words is "two hundred sixteen billion, three hundred fifty-five million, fifty-five thousand, twenty-one".