211202220120021 has 24 divisors (see below), whose sum is σ = 332495061409056. Its totient is φ = 128404686183840.

The previous prime is 211202220120019. The next prime is 211202220120041. The reversal of 211202220120021 is 120021022202112.

It is a happy number.

211202220120021 is a `hidden beast` number, since 21 + 1 + 202 + 220 + 1 + 200 + 21 = 666.

It is not a de Polignac number, because 211202220120021 - 2¹ = 211202220120019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211202220119976 and 211202220120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211202220120041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10874370895 + ... + 10874390316.

It is an arithmetic number, because the mean of its divisors is an integer number (13853960892044).

Almost surely, 2^{211202220120021} is an apocalyptic number.

It is an amenable number.

211202220120021 is a deficient number, since it is larger than the sum of its proper divisors (121292841289035).

211202220120021 is a wasteful number, since it uses less digits than its factorization.

211202220120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21748761313 (or 21748761310 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211202220120021 its reverse (120021022202112), we get a palindrome (331223242322133).

The spelling of 211202220120021 in words is "two hundred eleven trillion, two hundred two billion, two hundred twenty million, one hundred twenty thousand, twenty-one".