21103400023 has 8 divisors (see below), whose sum is σ = 21139959456. Its totient is φ = 21066864000.

The previous prime is 21103399981. The next prime is 21103400033. The reversal of 21103400023 is 32000430112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21103400023 - 2⁹ = 21103399511 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 (21103400033) 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 7 ways as a sum of consecutive naturals, for example, 3117963 + ... + 3124723.

It is an arithmetic number, because the mean of its divisors is an integer number (2642494932).

Almost surely, 2^21103400023 is an apocalyptic number.

21103400023 is a deficient number, since it is larger than the sum of its proper divisors (36559433).

21103400023 is an equidigital number, since it uses as much as digits as its factorization.

21103400023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11705.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21103400023 its reverse (32000430112), we get a palindrome (53103830135).

The spelling of 21103400023 in words is "twenty-one billion, one hundred three million, four hundred thousand, twenty-three".