21222122020001 has 4 divisors (see below), whose sum is σ = 24253853737152. Its totient is φ = 18190390302852.

The previous prime is 21222122019997. The next prime is 21222122020003. The reversal of 21222122020001 is 10002022122212.

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 21222122020001 - 2² = 21222122019997 is a prime.

It is a super-2 number, since 2×21222122020001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222122020003) 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, 1515865858565 + ... + 1515865858578.

It is an arithmetic number, because the mean of its divisors is an integer number (6063463434288).

Almost surely, 2^{21222122020001} is an apocalyptic number.

It is an amenable number.

21222122020001 is a deficient number, since it is larger than the sum of its proper divisors (3031731717151).

21222122020001 is an equidigital number, since it uses as much as digits as its factorization.

21222122020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031731717150.

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

Adding to 21222122020001 its reverse (10002022122212), we get a palindrome (31224144142213).

The spelling of 21222122020001 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, twenty thousand, one".