212222111121001 has 16 divisors (see below), whose sum is σ = 227816471116368. Its totient is φ = 196974167040000.

The previous prime is 212222111120989. The next prime is 212222111121109. The reversal of 212222111121001 is 100121111222212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 38573601885225 + 173648509235776 = 6210765^2 + 13177576^2 .

It is a cyclic number.

It is not a de Polignac number, because 212222111121001 - 2¹⁵ = 212222111088233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212222111121001.

It is not an unprimeable number, because it can be changed into a prime (212222111121401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3524940 + ... + 20901421.

It is an arithmetic number, because the mean of its divisors is an integer number (14238529444773).

Almost surely, 2^{212222111121001} is an apocalyptic number.

It is an amenable number.

212222111121001 is a deficient number, since it is larger than the sum of its proper divisors (15594359995367).

212222111121001 is a wasteful number, since it uses less digits than its factorization.

212222111121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24433452.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212222111121001 its reverse (100121111222212), we get a palindrome (312343222343213).

The spelling of 212222111121001 in words is "two hundred twelve trillion, two hundred twenty-two billion, one hundred eleven million, one hundred twenty-one thousand, one".