21888402368405 has 16 divisors (see below), whose sum is σ = 27113606668800. Its totient is φ = 16945715628480.

The previous prime is 21888402368363. The next prime is 21888402368423. The reversal of 21888402368405 is 50486320488812.

It is a happy number.

21888402368405 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 21888402368405 - 2⁶ = 21888402368341 is a prime.

It is a super-2 number, since 2×21888402368405² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19915391 + ... + 20985699.

It is an arithmetic number, because the mean of its divisors is an integer number (1694600416800).

Almost surely, 2^{21888402368405} is an apocalyptic number.

It is an amenable number.

21888402368405 is a deficient number, since it is larger than the sum of its proper divisors (5225204300395).

21888402368405 is a wasteful number, since it uses less digits than its factorization.

21888402368405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202284.

The product of its (nonzero) digits is 23592960, while the sum is 59.

The spelling of 21888402368405 in words is "twenty-one trillion, eight hundred eighty-eight billion, four hundred two million, three hundred sixty-eight thousand, four hundred five".