16212681681 has 16 divisors (see below), whose sum is σ = 25556937600. Its totient is φ = 8944927488.

The previous prime is 16212681649. The next prime is 16212681689. The reversal of 16212681681 is 18618621261.

It is not a de Polignac number, because 16212681681 - 2⁵ = 16212681649 is a prime.

It is a super-2 number, since 2×16212681681² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16212681689) 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 15 ways as a sum of consecutive naturals, for example, 13310296 + ... + 13311513.

It is an arithmetic number, because the mean of its divisors is an integer number (1597308600).

Almost surely, 2^16212681681 is an apocalyptic number.

It is an amenable number.

16212681681 is a deficient number, since it is larger than the sum of its proper divisors (9344255919).

16212681681 is a wasteful number, since it uses less digits than its factorization.

16212681681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26621848.

The product of its digits is 55296, while the sum is 42.

The spelling of 16212681681 in words is "sixteen billion, two hundred twelve million, six hundred eighty-one thousand, six hundred eighty-one".