21222020212001 has 8 divisors (see below), whose sum is σ = 24260487688704. Its totient is φ = 18185240311200.

The previous prime is 21222020211979. The next prime is 21222020212013. The reversal of 21222020212001 is 10021202022212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222020212001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21222020212201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421867025 + ... + 421917326.

It is an arithmetic number, because the mean of its divisors is an integer number (3032560961088).

Almost surely, 2^{21222020212001} is an apocalyptic number.

It is an amenable number.

21222020212001 is a deficient number, since it is larger than the sum of its proper divisors (3038467476703).

21222020212001 is an equidigital number, since it uses as much as digits as its factorization.

21222020212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843787951.

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

Adding to 21222020212001 its reverse (10021202022212), we get a palindrome (31243222234213).

The spelling of 21222020212001 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, two hundred twelve thousand, one".