21083553678399 has 8 divisors (see below), whose sum is σ = 28111438046640. Its totient is φ = 14055685881216.

The previous prime is 21083553678377. The next prime is 21083553678409. The reversal of 21083553678399 is 99387635538012.

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

It is not a de Polignac number, because 21083553678399 - 2²⁷ = 21083419460671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083553678329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785322 + ... + 6540935.

It is an arithmetic number, because the mean of its divisors is an integer number (3513929755830).

Almost surely, 2^{21083553678399} is an apocalyptic number.

21083553678399 is a deficient number, since it is larger than the sum of its proper divisors (7027884368241).

21083553678399 is an equidigital number, since it uses as much as digits as its factorization.

21083553678399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285529.

The product of its (nonzero) digits is 293932800, while the sum is 69.

The spelling of 21083553678399 in words is "twenty-one trillion, eighty-three billion, five hundred fifty-three million, six hundred seventy-eight thousand, three hundred ninety-nine".