222121122222001 has 8 divisors (see below), whose sum is σ = 224323004269800. Its totient is φ = 219919292390400.

The previous prime is 222121122221959. The next prime is 222121122222011. The reversal of 222121122222001 is 100222221121222.

It can be written as a sum of positive squares in 4 ways, for example, as 140243598317601 + 81877523904400 = 11842449^2 + 9048620^2 .

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-222121122222001 is a prime.

It is a super-2 number, since 2×222121122222001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121122222011) 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, 4476336 + ... + 21547153.

It is an arithmetic number, because the mean of its divisors is an integer number (28040375533725).

Almost surely, 2^{222121122222001} is an apocalyptic number.

It is an amenable number.

222121122222001 is a deficient number, since it is larger than the sum of its proper divisors (2201882047799).

222121122222001 is a wasteful number, since it uses less digits than its factorization.

222121122222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26108099.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222121122222001 its reverse (100222221121222), we get a palindrome (322343343343223).

The spelling of 222121122222001 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one".