21222010222001 has 4 divisors (see below), whose sum is σ = 21673542354432. Its totient is φ = 20770478089572.

The previous prime is 21222010221991. The next prime is 21222010222051. The reversal of 21222010222001 is 10022201022212.

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 21222010222001 - 2²² = 21222006027697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222010222051) 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, 225766066145 + ... + 225766066238.

It is an arithmetic number, because the mean of its divisors is an integer number (5418385588608).

Almost surely, 2^{21222010222001} is an apocalyptic number.

It is an amenable number.

21222010222001 is a deficient number, since it is larger than the sum of its proper divisors (451532132431).

21222010222001 is an equidigital number, since it uses as much as digits as its factorization.

21222010222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451532132430.

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

Adding to 21222010222001 its reverse (10022201022212), we get a palindrome (31244211244213).

The spelling of 21222010222001 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, two hundred twenty-two thousand, one".