211121212222001 has 16 divisors (see below), whose sum is σ = 222570479496960. Its totient is φ = 199862716363200.

The previous prime is 211121212221961. The next prime is 211121212222007. The reversal of 211121212222001 is 100222212121112.

It is a cyclic number.

It is not a de Polignac number, because 211121212222001 - 2¹⁸ = 211121211959857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121212222007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12340346 + ... + 23969283.

It is an arithmetic number, because the mean of its divisors is an integer number (13910654968560).

Almost surely, 2^{211121212222001} is an apocalyptic number.

It is an amenable number.

211121212222001 is a deficient number, since it is larger than the sum of its proper divisors (11449267274959).

211121212222001 is a wasteful number, since it uses less digits than its factorization.

211121212222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36312256.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211121212222001 its reverse (100222212121112), we get a palindrome (311343424343113).

The spelling of 211121212222001 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, one".