21110022222001 has 4 divisors (see below), whose sum is σ = 21110899235904. Its totient is φ = 21109145208100.

The previous prime is 21110022221987. The next prime is 21110022222041. The reversal of 21110022222001 is 10022222001112.

It is a happy number.

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 21110022222001 - 2¹⁵ = 21110022189233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110022222041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438470845 + ... + 438518986.

It is an arithmetic number, because the mean of its divisors is an integer number (5277724808976).

Almost surely, 2^{21110022222001} is an apocalyptic number.

It is an amenable number.

21110022222001 is a deficient number, since it is larger than the sum of its proper divisors (877013903).

21110022222001 is an equidigital number, since it uses as much as digits as its factorization.

21110022222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877013902.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21110022222001 its reverse (10022222001112), we get a palindrome (31132244223113).

The spelling of 21110022222001 in words is "twenty-one trillion, one hundred ten billion, twenty-two million, two hundred twenty-two thousand, one".