21675862723 has 2 divisors, whose sum is σ = 21675862724. Its totient is φ = 21675862722.

The previous prime is 21675862721. The next prime is 21675862729. The reversal of 21675862723 is 32726857612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21675862723 - 2¹ = 21675862721 is a prime.

Together with 21675862721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21675862721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837931361 + 10837931362.

It is an arithmetic number, because the mean of its divisors is an integer number (10837931362).

Almost surely, 2^21675862723 is an apocalyptic number.

21675862723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21675862723 is an equidigital number, since it uses as much as digits as its factorization.

21675862723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 49.

The spelling of 21675862723 in words is "twenty-one billion, six hundred seventy-five million, eight hundred sixty-two thousand, seven hundred twenty-three".