21404150023 has 4 divisors (see below), whose sum is σ = 21404464768. Its totient is φ = 21403835280.

The previous prime is 21404149993. The next prime is 21404150051. The reversal of 21404150023 is 32005140412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21404150023 - 2⁹ = 21404149511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21404149976 and 21404150003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404100023) 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 3 ways as a sum of consecutive naturals, for example, 8286 + ... + 207067.

It is an arithmetic number, because the mean of its divisors is an integer number (5351116192).

Almost surely, 2^21404150023 is an apocalyptic number.

21404150023 is a deficient number, since it is larger than the sum of its proper divisors (314745).

21404150023 is an equidigital number, since it uses as much as digits as its factorization.

21404150023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314744.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21404150023 its reverse (32005140412), we get a palindrome (53409290435).

The spelling of 21404150023 in words is "twenty-one billion, four hundred four million, one hundred fifty thousand, twenty-three".