212111221122001 has 4 divisors (see below), whose sum is σ = 212247277070400. Its totient is φ = 211975165173604.

The previous prime is 212111221121951. The next prime is 212111221122007. The reversal of 212111221122001 is 100221122111212.

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 212111221122001 - 2¹³ = 212111221113809 is a prime.

It is a super-2 number, since 2×212111221122001² (a number of 29 digits) contains 22 as substring.

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 212111221122001.

It is not an unprimeable number, because it can be changed into a prime (212111221122007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68027971861 + ... + 68027974978.

It is an arithmetic number, because the mean of its divisors is an integer number (53061819267600).

Almost surely, 2^{212111221122001} is an apocalyptic number.

It is an amenable number.

212111221122001 is a deficient number, since it is larger than the sum of its proper divisors (136055948399).

212111221122001 is a wasteful number, since it uses less digits than its factorization.

212111221122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136055948398.

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

Adding to 212111221122001 its reverse (100221122111212), we get a palindrome (312332343233213).

The spelling of 212111221122001 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, one".