212201011221 has 16 divisors (see below), whose sum is σ = 293732688960. Its totient is φ = 136103058560.

The previous prime is 212201011213. The next prime is 212201011223. The reversal of 212201011221 is 122110102212.

It is a cyclic number.

It is not a de Polignac number, because 212201011221 - 2³ = 212201011213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212201011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201011223) 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, 4315575 + ... + 4364468.

It is an arithmetic number, because the mean of its divisors is an integer number (18358293060).

Almost surely, 2^212201011221 is an apocalyptic number.

It is an amenable number.

212201011221 is a deficient number, since it is larger than the sum of its proper divisors (81531677739).

212201011221 is a wasteful number, since it uses less digits than its factorization.

212201011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8680356.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212201011221 its reverse (122110102212), we get a palindrome (334311113433).

Subtracting from 212201011221 its reverse (122110102212), we obtain a palindrome (90090909009).

The spelling of 212201011221 in words is "two hundred twelve billion, two hundred one million, eleven thousand, two hundred twenty-one".