21401404423 has 8 divisors (see below), whose sum is σ = 24459837440. Its totient is φ = 18343243800.

The previous prime is 21401404411. The next prime is 21401404429. The reversal of 21401404423 is 32440410412.

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

It is not a de Polignac number, because 21401404423 - 2⁵ = 21401404391 is a prime.

It is a super-2 number, since 2×21401404423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401404429) 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, 144538 + ... + 252376.

It is an arithmetic number, because the mean of its divisors is an integer number (3057479680).

Almost surely, 2^21401404423 is an apocalyptic number.

21401404423 is a deficient number, since it is larger than the sum of its proper divisors (3058433017).

21401404423 is a wasteful number, since it uses less digits than its factorization.

21401404423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136197.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21401404423 its reverse (32440410412), we get a palindrome (53841814835).

The spelling of 21401404423 in words is "twenty-one billion, four hundred one million, four hundred four thousand, four hundred twenty-three".