21414431421 has 36 divisors (see below), whose sum is σ = 31424108820. Its totient is φ = 14052487680.

The previous prime is 21414431417. The next prime is 21414431443. The reversal of 21414431421 is 12413441412.

21414431421 is a `hidden beast` number, since 214 + 1 + 443 + 1 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1396143225 + 20018288196 = 37365^2 + 141486^2 .

It is not a de Polignac number, because 21414431421 - 2² = 21414431417 is a prime.

It is a super-3 number, since 3×21414431421³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414431321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20031675 + ... + 20032743.

Almost surely, 2^21414431421 is an apocalyptic number.

It is an amenable number.

21414431421 is a deficient number, since it is larger than the sum of its proper divisors (10009677399).

21414431421 is a wasteful number, since it uses less digits than its factorization.

21414431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1442 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21414431421 its reverse (12413441412), we get a palindrome (33827872833).

Subtracting from 21414431421 its reverse (12413441412), we obtain a palindrome (9000990009).

The spelling of 21414431421 in words is "twenty-one billion, four hundred fourteen million, four hundred thirty-one thousand, four hundred twenty-one".