23340817821 has 16 divisors (see below), whose sum is σ = 31357327104. Its totient is φ = 15442493184.

The previous prime is 23340817813. The next prime is 23340817837. The reversal of 23340817821 is 12871804332.

It is not a de Polignac number, because 23340817821 - 2³ = 23340817813 is a prime.

It is a super-2 number, since 2×23340817821² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23340817821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23340817861) 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, 2023356 + ... + 2034858.

It is an arithmetic number, because the mean of its divisors is an integer number (1959832944).

Almost surely, 2^23340817821 is an apocalyptic number.

It is an amenable number.

23340817821 is a deficient number, since it is larger than the sum of its proper divisors (8016509283).

23340817821 is a wasteful number, since it uses less digits than its factorization.

23340817821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16580.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 23340817821 in words is "twenty-three billion, three hundred forty million, eight hundred seventeen thousand, eight hundred twenty-one".