216721438619722 has 8 divisors (see below), whose sum is σ = 325086795612000. Its totient is φ = 108359173415724.

The previous prime is 216721438619701. The next prime is 216721438619723. The reversal of 216721438619722 is 227916834127612.

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

It is not an unprimeable number, because it can be changed into a prime (216721438619723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772771822 + ... + 773052217.

It is an arithmetic number, because the mean of its divisors is an integer number (40635849451500).

Almost surely, 2^{216721438619722} is an apocalyptic number.

216721438619722 is a deficient number, since it is larger than the sum of its proper divisors (108365356992278).

216721438619722 is a wasteful number, since it uses less digits than its factorization.

216721438619722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545894140.

The product of its digits is 24385536, while the sum is 61.

The spelling of 216721438619722 in words is "two hundred sixteen trillion, seven hundred twenty-one billion, four hundred thirty-eight million, six hundred nineteen thousand, seven hundred twenty-two".