21414435406 has 24 divisors (see below), whose sum is σ = 40240315080. Its totient is φ = 8471644272.

The previous prime is 21414435401. The next prime is 21414435421. The reversal of 21414435406 is 60453441412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414435401) 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 11 ways as a sum of consecutive naturals, for example, 8403136 + ... + 8405683.

It is an arithmetic number, because the mean of its divisors is an integer number (1676679795).

Almost surely, 2^21414435406 is an apocalyptic number.

21414435406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21414435406 is a deficient number, since it is larger than the sum of its proper divisors (18825879674).

21414435406 is a wasteful number, since it uses less digits than its factorization.

21414435406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16808848 (or 16808841 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 21414435406 its reverse (60453441412), we get a palindrome (81867876818).

The spelling of 21414435406 in words is "twenty-one billion, four hundred fourteen million, four hundred thirty-five thousand, four hundred six".