202110122021 has 2 divisors, whose sum is σ = 202110122022. Its totient is φ = 202110122020.

The previous prime is 202110122009. The next prime is 202110122069. The reversal of 202110122021 is 120221011202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177903429796 + 24206692225 = 421786^2 + 155585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202110122021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202110121987 and 202110122005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202110122521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055061010 + 101055061011.

It is an arithmetic number, because the mean of its divisors is an integer number (101055061011).

Almost surely, 2^202110122021 is an apocalyptic number.

It is an amenable number.

202110122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202110122021 is an equidigital number, since it uses as much as digits as its factorization.

202110122021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202110122021 its reverse (120221011202), we get a palindrome (322331133223).

The spelling of 202110122021 in words is "two hundred two billion, one hundred ten million, one hundred twenty-two thousand, twenty-one".