216507004722 has 18 divisors (see below), whose sum is σ = 469102787517. Its totient is φ = 72168343536.

The previous prime is 216507004697. The next prime is 216507004729. The reversal of 216507004722 is 227400705612.

It is a happy number.

216507004722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196755232041 + 19751772681 = 443571^2 + 140541^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=329019.

It is a super-3 number, since 3×216507004722³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (216507004729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1919278 + ... + 2028950.

Almost surely, 2^216507004722 is an apocalyptic number.

216507004722 is an abundant number, since it is smaller than the sum of its proper divisors (252595782795).

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

216507004722 is an frugal number, since it uses more digits than its factorization.

216507004722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219354 (or 109678 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The spelling of 216507004722 in words is "two hundred sixteen billion, five hundred seven million, four thousand, seven hundred twenty-two".