21677685053 has 4 divisors (see below), whose sum is σ = 22376965248. Its totient is φ = 20978404860.

The previous prime is 21677685041. The next prime is 21677685059. The reversal of 21677685053 is 35058677612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21677685053 - 2⁴ = 21677685037 is a prime.

It is a super-2 number, since 2×21677685053² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21677684992 and 21677685010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21677685059) 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 3 ways as a sum of consecutive naturals, for example, 349640051 + ... + 349640112.

It is an arithmetic number, because the mean of its divisors is an integer number (5594241312).

Almost surely, 2^21677685053 is an apocalyptic number.

It is an amenable number.

21677685053 is a deficient number, since it is larger than the sum of its proper divisors (699280195).

21677685053 is an equidigital number, since it uses as much as digits as its factorization.

21677685053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699280194.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 21677685053 in words is "twenty-one billion, six hundred seventy-seven million, six hundred eighty-five thousand, fifty-three".