21404122443 has 24 divisors (see below), whose sum is σ = 33774214656. Its totient is φ = 12954308400.

The previous prime is 21404122429. The next prime is 21404122457. The reversal of 21404122443 is 34422140412.

21404122443 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 412 + 244 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21404122429) and next prime (21404122457).

It is not a de Polignac number, because 21404122443 - 2⁶ = 21404122379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21404122543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76723 + ... + 220668.

It is an arithmetic number, because the mean of its divisors is an integer number (1407258944).

Almost surely, 2^21404122443 is an apocalyptic number.

21404122443 is a deficient number, since it is larger than the sum of its proper divisors (12370092213).

21404122443 is a wasteful number, since it uses less digits than its factorization.

21404122443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298135 (or 298132 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21404122443 its reverse (34422140412), we get a palindrome (55826262855).

The spelling of 21404122443 in words is "twenty-one billion, four hundred four million, one hundred twenty-two thousand, four hundred forty-three".