202111222021 has 24 divisors (see below), whose sum is σ = 220397313920. Its totient is φ = 185240120832.

The previous prime is 202111221989. The next prime is 202111222031. The reversal of 202111222021 is 120222111202.

It is a happy number.

It is not a de Polignac number, because 202111222021 - 2⁵ = 202111221989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202111221986 and 202111222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202111222031) 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, 1606030 + ... + 1727296.

Almost surely, 2^202111222021 is an apocalyptic number.

It is an amenable number.

202111222021 is a deficient number, since it is larger than the sum of its proper divisors (18286091899).

202111222021 is a wasteful number, since it uses less digits than its factorization.

202111222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121453 (or 121436 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202111222021 its reverse (120222111202), we get a palindrome (322333333223).

The spelling of 202111222021 in words is "two hundred two billion, one hundred eleven million, two hundred twenty-two thousand, twenty-one".