21675036893 has 2 divisors, whose sum is σ = 21675036894. Its totient is φ = 21675036892.

The previous prime is 21675036883. The next prime is 21675036899. The reversal of 21675036893 is 39863057612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20322783364 + 1352253529 = 142558^2 + 36773^2 .

It is a cyclic number.

It is not a de Polignac number, because 21675036893 - 2¹⁸ = 21674774749 is a prime.

It is a super-2 number, since 2×21675036893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21675036899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837518446 + 10837518447.

It is an arithmetic number, because the mean of its divisors is an integer number (10837518447).

Almost surely, 2^21675036893 is an apocalyptic number.

It is an amenable number.

21675036893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21675036893 is an equidigital number, since it uses as much as digits as its factorization.

21675036893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 21675036893 in words is "twenty-one billion, six hundred seventy-five million, thirty-six thousand, eight hundred ninety-three".