216211721151 has 8 divisors (see below), whose sum is σ = 290050898560. Its totient is φ = 143256845592.

The previous prime is 216211721113. The next prime is 216211721203. The reversal of 216211721151 is 151127112612.

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

It is not a de Polignac number, because 216211721151 - 2⁶ = 216211721087 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 (216211721101) 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, 221074891 + ... + 221075868.

It is an arithmetic number, because the mean of its divisors is an integer number (36256362320).

Almost surely, 2^216211721151 is an apocalyptic number.

216211721151 is a deficient number, since it is larger than the sum of its proper divisors (73839177409).

216211721151 is a wasteful number, since it uses less digits than its factorization.

216211721151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442150925.

The product of its digits is 1680, while the sum is 30.

Adding to 216211721151 its reverse (151127112612), we get a palindrome (367338833763).

The spelling of 216211721151 in words is "two hundred sixteen billion, two hundred eleven million, seven hundred twenty-one thousand, one hundred fifty-one".