211121220001 has 8 divisors (see below), whose sum is σ = 218452645800. Its totient is φ = 203793219840.

The previous prime is 211121219999. The next prime is 211121220007. The reversal of 211121220001 is 100022121112.

It can be written as a sum of positive squares in 4 ways, for example, as 67248936976 + 143872283025 = 259324^2 + 379305^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 211121220001 - 2¹ = 211121219999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121220007) 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, 730696 + ... + 977833.

It is an arithmetic number, because the mean of its divisors is an integer number (27306580725).

Almost surely, 2^211121220001 is an apocalyptic number.

It is an amenable number.

211121220001 is a deficient number, since it is larger than the sum of its proper divisors (7331425799).

211121220001 is a wasteful number, since it uses less digits than its factorization.

211121220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712819.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211121220001 its reverse (100022121112), we get a palindrome (311143341113).

The spelling of 211121220001 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, one".