212001101221 has 64 divisors (see below), whose sum is σ = 279353733120. Its totient is φ = 156115307520.

The previous prime is 212001101203. The next prime is 212001101237. The reversal of 212001101221 is 122101100212.

It is a cyclic number.

It is not a de Polignac number, because 212001101221 - 2⁵ = 212001101189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001101321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 160728000 + ... + 160729318.

It is an arithmetic number, because the mean of its divisors is an integer number (4364902080).

Almost surely, 2^212001101221 is an apocalyptic number.

It is an amenable number.

212001101221 is a deficient number, since it is larger than the sum of its proper divisors (67352631899).

212001101221 is a wasteful number, since it uses less digits than its factorization.

212001101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434.

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

Adding to 212001101221 its reverse (122101100212), we get a palindrome (334102201433).

The spelling of 212001101221 in words is "two hundred twelve billion, one million, one hundred one thousand, two hundred twenty-one".