211221200001 has 16 divisors (see below), whose sum is σ = 327316147200. Its totient is φ = 118652101968.

The previous prime is 211221199991. The next prime is 211221200017. The reversal of 211221200001 is 100002122112.

It is not a de Polignac number, because 211221200001 - 2⁷ = 211221199873 is a prime.

It is a super-2 number, since 2×211221200001² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221200001.

It is not an unprimeable number, because it can be changed into a prime (211221208001) 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, 85237341 + ... + 85239818.

It is an arithmetic number, because the mean of its divisors is an integer number (20457259200).

Almost surely, 2^211221200001 is an apocalyptic number.

211221200001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211221200001 is a deficient number, since it is larger than the sum of its proper divisors (116094947199).

211221200001 is a wasteful number, since it uses less digits than its factorization.

211221200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170477228.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 211221200001 its reverse (100002122112), we get a palindrome (311223322113).

The spelling of 211221200001 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thousand, one".