21414400021 has 16 divisors (see below), whose sum is σ = 24690032640. Its totient is φ = 18193155120.

The previous prime is 21414400019. The next prime is 21414400027. The reversal of 21414400021 is 12000441412.

It is not a de Polignac number, because 21414400021 - 2¹ = 21414400019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414400027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 958860 + ... + 980938.

It is an arithmetic number, because the mean of its divisors is an integer number (1543127040).

Almost surely, 2^21414400021 is an apocalyptic number.

It is an amenable number.

21414400021 is a deficient number, since it is larger than the sum of its proper divisors (3275632619).

21414400021 is a wasteful number, since it uses less digits than its factorization.

21414400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23304.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21414400021 its reverse (12000441412), we get a palindrome (33414841433).

The spelling of 21414400021 in words is "twenty-one billion, four hundred fourteen million, four hundred thousand, twenty-one".