212220101211021 has 24 divisors (see below), whose sum is σ = 307354440673280. Its totient is φ = 141104252572416.

The previous prime is 212220101210989. The next prime is 212220101211047. The reversal of 212220101211021 is 120112101022212.

212220101211021 is a `hidden beast` number, since 212 + 220 + 1 + 0 + 1 + 211 + 0 + 21 = 666.

It is not a de Polignac number, because 212220101211021 - 2⁵ = 212220101210989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220101210985 and 212220101211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220101211721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201518580 + ... + 202568946.

Almost surely, 2^{212220101211021} is an apocalyptic number.

It is an amenable number.

212220101211021 is a deficient number, since it is larger than the sum of its proper divisors (95134339462259).

212220101211021 is a wasteful number, since it uses less digits than its factorization.

212220101211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109985 (or 1109982 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212220101211021 its reverse (120112101022212), we get a palindrome (332332202233233).

The spelling of 212220101211021 in words is "two hundred twelve trillion, two hundred twenty billion, one hundred one million, two hundred eleven thousand, twenty-one".