212222202021 has 24 divisors (see below), whose sum is σ = 316777814496. Its totient is φ = 136822946400.

The previous prime is 212222202019. The next prime is 212222202061. The reversal of 212222202021 is 120202222212.

212222202021 is a `hidden beast` number, since 21 + 222 + 220 + 202 + 1 = 666.

212222202021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212222202021 - 2¹ = 212222202019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212222201985 and 212222202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222202061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2675655 + ... + 2753828.

It is an arithmetic number, because the mean of its divisors is an integer number (13199075604).

Almost surely, 2^212222202021 is an apocalyptic number.

It is an amenable number.

212222202021 is a deficient number, since it is larger than the sum of its proper divisors (104555612475).

212222202021 is a wasteful number, since it uses less digits than its factorization.

212222202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429633 (or 5429630 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212222202021 its reverse (120202222212), we get a palindrome (332424424233).

The spelling of 212222202021 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred two thousand, twenty-one".