202110022021 has 4 divisors (see below), whose sum is σ = 202799817612. Its totient is φ = 201420226432.

The previous prime is 202110021943. The next prime is 202110022043. The reversal of 202110022021 is 120220011202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119460096900 + 82649925121 = 345630^2 + 287489^2 .

It is a cyclic number.

It is not a de Polignac number, because 202110022021 - 2¹¹ = 202110019973 is a prime.

It is a super-2 number, since 2×202110022021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202110021992 and 202110022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202110022321) 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, 344897356 + ... + 344897941.

It is an arithmetic number, because the mean of its divisors is an integer number (50699954403).

Almost surely, 2^202110022021 is an apocalyptic number.

It is an amenable number.

202110022021 is a deficient number, since it is larger than the sum of its proper divisors (689795591).

202110022021 is an equidigital number, since it uses as much as digits as its factorization.

202110022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689795590.

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

Adding to 202110022021 its reverse (120220011202), we get a palindrome (322330033223).

The spelling of 202110022021 in words is "two hundred two billion, one hundred ten million, twenty-two thousand, twenty-one".