21186862272853 has 2 divisors, whose sum is σ = 21186862272854. Its totient is φ = 21186862272852.

The previous prime is 21186862272811. The next prime is 21186862272887. The reversal of 21186862272853 is 35827226868112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19870973389969 + 1315888882884 = 4457687^2 + 1147122^2 .

It is a cyclic number.

It is not a de Polignac number, because 21186862272853 - 2³⁷ = 21049423319381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21186862272791 and 21186862272800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21186862270853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10593431136426 + 10593431136427.

It is an arithmetic number, because the mean of its divisors is an integer number (10593431136427).

Almost surely, 2^{21186862272853} is an apocalyptic number.

It is an amenable number.

21186862272853 is a deficient number, since it is larger than the sum of its proper divisors (1).

21186862272853 is an equidigital number, since it uses as much as digits as its factorization.

21186862272853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30965760, while the sum is 61.

The spelling of 21186862272853 in words is "twenty-one trillion, one hundred eighty-six billion, eight hundred sixty-two million, two hundred seventy-two thousand, eight hundred fifty-three".