21022643001 has 4 divisors (see below), whose sum is σ = 28030190672. Its totient is φ = 14015095332.

The previous prime is 21022642987. The next prime is 21022643009. The reversal of 21022643001 is 10034622012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21022643001 - 2⁹ = 21022642489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022643009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503773831 + ... + 3503773836.

It is an arithmetic number, because the mean of its divisors is an integer number (7007547668).

Almost surely, 2^21022643001 is an apocalyptic number.

It is an amenable number.

21022643001 is a deficient number, since it is larger than the sum of its proper divisors (7007547671).

21022643001 is an equidigital number, since it uses as much as digits as its factorization.

21022643001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007547670.

The product of its (nonzero) digits is 576, while the sum is 21.

The spelling of 21022643001 in words is "twenty-one billion, twenty-two million, six hundred forty-three thousand, one".