21220122220001 has 4 divisors (see below), whose sum is σ = 21220137001392. Its totient is φ = 21220107438612.

The previous prime is 21220122219997. The next prime is 21220122220007. The reversal of 21220122220001 is 10002222102212.

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 21220122220001 - 2² = 21220122219997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220122220007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4973855 + ... + 8196308.

It is an arithmetic number, because the mean of its divisors is an integer number (5305034250348).

Almost surely, 2^{21220122220001} is an apocalyptic number.

It is an amenable number.

21220122220001 is a deficient number, since it is larger than the sum of its proper divisors (14781391).

21220122220001 is a wasteful number, since it uses less digits than its factorization.

21220122220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14781390.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220122220001 its reverse (10002222102212), we get a palindrome (31222344322213).

The spelling of 21220122220001 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twenty thousand, one".