21667839253 has 2 divisors, whose sum is σ = 21667839254. Its totient is φ = 21667839252.

The previous prime is 21667839251. The next prime is 21667839257. The reversal of 21667839253 is 35293876612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11438944209 + 10228895044 = 106953^2 + 101138^2 .

It is a cyclic number.

It is not a de Polignac number, because 21667839253 - 2¹ = 21667839251 is a prime.

It is a super-3 number, since 3×21667839253³ (a number of 32 digits) contains 333 as substring.

Together with 21667839251, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21667839253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21667839251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833919626 + 10833919627.

It is an arithmetic number, because the mean of its divisors is an integer number (10833919627).

Almost surely, 2^21667839253 is an apocalyptic number.

It is an amenable number.

21667839253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667839253 is an equidigital number, since it uses as much as digits as its factorization.

21667839253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 52.

The spelling of 21667839253 in words is "twenty-one billion, six hundred sixty-seven million, eight hundred thirty-nine thousand, two hundred fifty-three".