210122201021 has 2 divisors, whose sum is σ = 210122201022. Its totient is φ = 210122201020.

The previous prime is 210122200999. The next prime is 210122201087. The reversal of 210122201021 is 120102221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209480136100 + 642064921 = 457690^2 + 25339^2 .

It is a cyclic number.

It is not a de Polignac number, because 210122201021 - 2¹⁴ = 210122184637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210122200987 and 210122201005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210122207021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061100510 + 105061100511.

It is an arithmetic number, because the mean of its divisors is an integer number (105061100511).

Almost surely, 2^210122201021 is an apocalyptic number.

It is an amenable number.

210122201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210122201021 is an equidigital number, since it uses as much as digits as its factorization.

210122201021 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 210122201021 its reverse (120102221012), we get a palindrome (330224422033).

The spelling of 210122201021 in words is "two hundred ten billion, one hundred twenty-two million, two hundred one thousand, twenty-one".