21401404430 has 16 divisors (see below), whose sum is σ = 44025746400. Its totient is φ = 7337624352.

The previous prime is 21401404429. The next prime is 21401404511. The reversal of 21401404430 is 3440410412.

It is a happy number.

It is a super-2 number, since 2×21401404430² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21401404396 and 21401404405.

It is a congruent number.

It is an unprimeable number.

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, 152867105 + ... + 152867244.

It is an arithmetic number, because the mean of its divisors is an integer number (2751609150).

Almost surely, 2^21401404430 is an apocalyptic number.

21401404430 is an abundant number, since it is smaller than the sum of its proper divisors (22624341970).

21401404430 is a wasteful number, since it uses less digits than its factorization.

21401404430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305734363.

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

Adding to 21401404430 its reverse (3440410412), we get a palindrome (24841814842).

The spelling of 21401404430 in words is "twenty-one billion, four hundred one million, four hundred four thousand, four hundred thirty".