21093604643 has 2 divisors, whose sum is σ = 21093604644. Its totient is φ = 21093604642.

The previous prime is 21093604639. The next prime is 21093604663. The reversal of 21093604643 is 34640639012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21093604643 - 2² = 21093604639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21093604597 and 21093604606.

It is not a weakly prime, because it can be changed into another prime (21093604663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10546802321 + 10546802322.

It is an arithmetic number, because the mean of its divisors is an integer number (10546802322).

Almost surely, 2^21093604643 is an apocalyptic number.

21093604643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21093604643 is an equidigital number, since it uses as much as digits as its factorization.

21093604643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 21093604643 in words is "twenty-one billion, ninety-three million, six hundred four thousand, six hundred forty-three".