21404469405 has 32 divisors (see below), whose sum is σ = 38565715968. Its totient is φ = 10043150400.

The previous prime is 21404469391. The next prime is 21404469469. The reversal of 21404469405 is 50496440412.

It is not a de Polignac number, because 21404469405 - 2²¹ = 21402372253 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2087209 + ... + 2097438.

It is an arithmetic number, because the mean of its divisors is an integer number (1205178624).

Almost surely, 2^21404469405 is an apocalyptic number.

It is an amenable number.

21404469405 is a deficient number, since it is larger than the sum of its proper divisors (17161246563).

21404469405 is a wasteful number, since it uses less digits than its factorization.

21404469405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184697.

The product of its (nonzero) digits is 138240, while the sum is 39.

It can be divided in two parts, 2140 and 4469405, that added together give a triangular number (4471545 = T₂₉₉₀).

The spelling of 21404469405 in words is "twenty-one billion, four hundred four million, four hundred sixty-nine thousand, four hundred five".