21410831806 has 32 divisors (see below), whose sum is σ = 39697414848. Its totient is φ = 8433849600.

The previous prime is 21410831749. The next prime is 21410831833. The reversal of 21410831806 is 60813801412.

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, 210045 + ... + 294856.

It is an arithmetic number, because the mean of its divisors is an integer number (1240544214).

Almost surely, 2^21410831806 is an apocalyptic number.

21410831806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21410831806 is a deficient number, since it is larger than the sum of its proper divisors (18286583042).

21410831806 is a wasteful number, since it uses less digits than its factorization.

21410831806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505156.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 21410831806 in words is "twenty-one billion, four hundred ten million, eight hundred thirty-one thousand, eight hundred six".