21423402023 has 8 divisors (see below), whose sum is σ = 23022164592. Its totient is φ = 19862257536.

The previous prime is 21423402017. The next prime is 21423402059. The reversal of 21423402023 is 32020432412.

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 21423402023 - 2⁸ = 21423401767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21423402023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423402073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9403340 + ... + 9405617.

It is an arithmetic number, because the mean of its divisors is an integer number (2877770574).

Almost surely, 2^21423402023 is an apocalyptic number.

21423402023 is a deficient number, since it is larger than the sum of its proper divisors (1598762569).

21423402023 is a wasteful number, since it uses less digits than its factorization.

21423402023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18809041.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21423402023 its reverse (32020432412), we get a palindrome (53443834435).

The spelling of 21423402023 in words is "twenty-one billion, four hundred twenty-three million, four hundred two thousand, twenty-three".