21110022001 has 4 divisors (see below), whose sum is σ = 21138588400. Its totient is φ = 21081455604.

The previous prime is 21110021987. The next prime is 21110022013. The reversal of 21110022001 is 10022001112.

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 a cyclic number.

It is not a de Polignac number, because 21110022001 - 2¹⁹ = 21109497713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110022041) 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, 14282091 + ... + 14283568.

It is an arithmetic number, because the mean of its divisors is an integer number (5284647100).

Almost surely, 2^21110022001 is an apocalyptic number.

It is an amenable number.

21110022001 is a deficient number, since it is larger than the sum of its proper divisors (28566399).

21110022001 is an equidigital number, since it uses as much as digits as its factorization.

21110022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28566398.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21110022001 its reverse (10022001112), we get a palindrome (31132023113).

The spelling of 21110022001 in words is "twenty-one billion, one hundred ten million, twenty-two thousand, one".