23218206781 has 16 divisors (see below), whose sum is σ = 28951787520. Its totient is φ = 18089351280.

The previous prime is 23218206743. The next prime is 23218206797. The reversal of 23218206781 is 18760281232.

It is a happy number.

It is not a de Polignac number, because 23218206781 - 2⁷ = 23218206653 is a prime.

It is a super-2 number, since 2×23218206781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23218206181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591360 + ... + 629398.

It is an arithmetic number, because the mean of its divisors is an integer number (1809486720).

Almost surely, 2^23218206781 is an apocalyptic number.

It is an amenable number.

23218206781 is a deficient number, since it is larger than the sum of its proper divisors (5733580739).

23218206781 is a wasteful number, since it uses less digits than its factorization.

23218206781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45984.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 23218206781 in words is "twenty-three billion, two hundred eighteen million, two hundred six thousand, seven hundred eighty-one".