212201020021 has 4 divisors (see below), whose sum is σ = 214184207232. Its totient is φ = 210217832812.

The previous prime is 212201020013. The next prime is 212201020033. The reversal of 212201020021 is 120020102212.

It is a happy number.

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 212201020021 - 2³ = 212201020013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212201019983 and 212201020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201020321) 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, 991593445 + ... + 991593658.

It is an arithmetic number, because the mean of its divisors is an integer number (53546051808).

Almost surely, 2^212201020021 is an apocalyptic number.

It is an amenable number.

212201020021 is a deficient number, since it is larger than the sum of its proper divisors (1983187211).

212201020021 is a wasteful number, since it uses less digits than its factorization.

212201020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983187210.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212201020021 its reverse (120020102212), we get a palindrome (332221122233).

The spelling of 212201020021 in words is "two hundred twelve billion, two hundred one million, twenty thousand, twenty-one".