211211221012201 has 4 divisors (see below), whose sum is σ = 211324714416004. Its totient is φ = 211097727608400.

The previous prime is 211211221012163. The next prime is 211211221012237. The reversal of 211211221012201 is 102210122112112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87716786044176 + 123494434968025 = 9365724^2 + 11112805^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211221012201 - 2²⁷ = 211211086794473 is a prime.

It is a super-2 number, since 2×211211221012201² (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 (211211221012801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56746699110 + ... + 56746702831.

It is an arithmetic number, because the mean of its divisors is an integer number (52831178604001).

Almost surely, 2^{211211221012201} is an apocalyptic number.

It is an amenable number.

211211221012201 is a deficient number, since it is larger than the sum of its proper divisors (113493403803).

211211221012201 is a wasteful number, since it uses less digits than its factorization.

211211221012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113493403802.

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

Adding to 211211221012201 its reverse (102210122112112), we get a palindrome (313421343124313).

The spelling of 211211221012201 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, twelve thousand, two hundred one".