21404114399 has 2 divisors, whose sum is σ = 21404114400. Its totient is φ = 21404114398.

The previous prime is 21404114359. The next prime is 21404114437. The reversal of 21404114399 is 99341140412.

It is a happy number.

It is an a-pointer prime, because the next prime (21404114437) can be obtained adding 21404114399 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404114399 - 2²⁴ = 21387337183 is a prime.

It is a super-3 number, since 3×21404114399³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404114339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702057199 + 10702057200.

It is an arithmetic number, because the mean of its divisors is an integer number (10702057200).

Almost surely, 2^21404114399 is an apocalyptic number.

21404114399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404114399 is an equidigital number, since it uses as much as digits as its factorization.

21404114399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 21404114399 in words is "twenty-one billion, four hundred four million, one hundred fourteen thousand, three hundred ninety-nine".