216021798396 has 24 divisors (see below), whose sum is σ = 560056514640. Its totient is φ = 72007266096.

The previous prime is 216021798389. The next prime is 216021798397. The reversal of 216021798396 is 693897120612.

216021798396 is a `hidden beast` number, since 2 + 160 + 2 + 1 + 7 + 98 + 396 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216021798397) 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, 1000100811 + ... + 1000101026.

It is an arithmetic number, because the mean of its divisors is an integer number (23335688110).

Almost surely, 2^216021798396 is an apocalyptic number.

It is an amenable number.

216021798396 is an abundant number, since it is smaller than the sum of its proper divisors (344034716244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216021798396 is a wasteful number, since it uses less digits than its factorization.

216021798396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000201850 (or 2000201842 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 216021798396 in words is "two hundred sixteen billion, twenty-one million, seven hundred ninety-eight thousand, three hundred ninety-six".