21222221121201 has 8 divisors (see below), whose sum is σ = 29785573503520. Its totient is φ = 13403508076512.

The previous prime is 21222221121173. The next prime is 21222221121203. The reversal of 21222221121201 is 10212112222212.

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

It is not a de Polignac number, because 21222221121201 - 2⁶ = 21222221121137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222221121203) 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, 186159834340 + ... + 186159834453.

It is an arithmetic number, because the mean of its divisors is an integer number (3723196687940).

Almost surely, 2^{21222221121201} is an apocalyptic number.

It is an amenable number.

21222221121201 is a deficient number, since it is larger than the sum of its proper divisors (8563352382319).

21222221121201 is a wasteful number, since it uses less digits than its factorization.

21222221121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372319668815.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222221121201 its reverse (10212112222212), we get a palindrome (31434333343413).

It can be divided in two parts, 2122222 and 1121201, that added together give a palindrome (3243423).

The spelling of 21222221121201 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred one".