21085827477103 has 4 divisors (see below), whose sum is σ = 21382810962768. Its totient is φ = 20788843991440.

The previous prime is 21085827477097. The next prime is 21085827477133. The reversal of 21085827477103 is 30177472858012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21085827477103 is a prime.

It is a super-2 number, since 2×21085827477103² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21085827477133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148491742726 + ... + 148491742867.

It is an arithmetic number, because the mean of its divisors is an integer number (5345702740692).

Almost surely, 2^{21085827477103} is an apocalyptic number.

21085827477103 is a deficient number, since it is larger than the sum of its proper divisors (296983485665).

21085827477103 is an equidigital number, since it uses as much as digits as its factorization.

21085827477103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296983485664.

The product of its (nonzero) digits is 5268480, while the sum is 55.

It can be divided in two parts, 210858 and 27477103, that added together give a triangular number (27687961 = T₇₄₄₁).

The spelling of 21085827477103 in words is "twenty-one trillion, eighty-five billion, eight hundred twenty-seven million, four hundred seventy-seven thousand, one hundred three".