21641314405 has 8 divisors (see below), whose sum is σ = 26008169112. Its totient is φ = 17287323648.

The previous prime is 21641314397. The next prime is 21641314439. The reversal of 21641314405 is 50441314612.

It can be written as a sum of positive squares in 4 ways, for example, as 7426475329 + 14214839076 = 86177^2 + 119226^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21641314405 - 2³ = 21641314397 is a prime.

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, 3212284 + ... + 3219013.

It is an arithmetic number, because the mean of its divisors is an integer number (3251021139).

Almost surely, 2^21641314405 is an apocalyptic number.

It is an amenable number.

21641314405 is a deficient number, since it is larger than the sum of its proper divisors (4366854707).

21641314405 is an equidigital number, since it uses as much as digits as its factorization.

21641314405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431975.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21641314405 in words is "twenty-one billion, six hundred forty-one million, three hundred fourteen thousand, four hundred five".