21335401405 has 8 divisors (see below), whose sum is σ = 26428368384. Its totient is φ = 16517730000.

The previous prime is 21335401369. The next prime is 21335401433. The reversal of 21335401405 is 50410453312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21335401405 - 2²⁷ = 21201183677 is a prime.

It is a super-2 number, since 2×21335401405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68823721 + ... + 68824030.

It is an arithmetic number, because the mean of its divisors is an integer number (3303546048).

Almost surely, 2^21335401405 is an apocalyptic number.

It is an amenable number.

21335401405 is a deficient number, since it is larger than the sum of its proper divisors (5092966979).

21335401405 is a wasteful number, since it uses less digits than its factorization.

21335401405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137647787.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21335401405 its reverse (50410453312), we get a palindrome (71745854717).

It can be divided in two parts, 21335 and 401405, that added together give a triangular number (422740 = T₉₁₉).

The spelling of 21335401405 in words is "twenty-one billion, three hundred thirty-five million, four hundred one thousand, four hundred five".