21408320877 has 8 divisors (see below), whose sum is σ = 28548635040. Its totient is φ = 14270110320.

The previous prime is 21408320849. The next prime is 21408320909. The reversal of 21408320877 is 77802380412.

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

It is not a de Polignac number, because 21408320877 - 2¹¹ = 21408318829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21408320827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501999 + ... + 542972.

It is an arithmetic number, because the mean of its divisors is an integer number (3568579380).

Almost surely, 2^21408320877 is an apocalyptic number.

It is an amenable number.

21408320877 is a deficient number, since it is larger than the sum of its proper divisors (7140314163).

21408320877 is a wasteful number, since it uses less digits than its factorization.

21408320877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051803.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 21408320877 in words is "twenty-one billion, four hundred eight million, three hundred twenty thousand, eight hundred seventy-seven".