21402401423 has 8 divisors (see below), whose sum is σ = 23103754800. Its totient is φ = 19708907328.

The previous prime is 21402401411. The next prime is 21402401437. The reversal of 21402401423 is 32410420412.

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 21402401423 - 2⁶ = 21402401359 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 (21402401723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1959158 + ... + 1970051.

It is an arithmetic number, because the mean of its divisors is an integer number (2887969350).

Almost surely, 2^21402401423 is an apocalyptic number.

21402401423 is a deficient number, since it is larger than the sum of its proper divisors (1701353377).

21402401423 is a wasteful number, since it uses less digits than its factorization.

21402401423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929641.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21402401423 its reverse (32410420412), we get a palindrome (53812821835).

The spelling of 21402401423 in words is "twenty-one billion, four hundred two million, four hundred one thousand, four hundred twenty-three".