211212201020221 has 4 divisors (see below), whose sum is σ = 211333100965312. Its totient is φ = 211091301075132.

The previous prime is 211212201020099. The next prime is 211212201020243. The reversal of 211212201020221 is 122020102212112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211212201020221 - 2⁹ = 211212201019709 is a prime.

It is a super-2 number, since 2×211212201020221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212201024221) 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, 60449969925 + ... + 60449973418.

It is an arithmetic number, because the mean of its divisors is an integer number (52833275241328).

Almost surely, 2^{211212201020221} is an apocalyptic number.

It is an amenable number.

211212201020221 is a deficient number, since it is larger than the sum of its proper divisors (120899945091).

211212201020221 is a wasteful number, since it uses less digits than its factorization.

211212201020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120899945090.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211212201020221 its reverse (122020102212112), we get a palindrome (333232303232333).

The spelling of 211212201020221 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred one million, twenty thousand, two hundred twenty-one".