202122430021 has 2 divisors, whose sum is σ = 202122430022. Its totient is φ = 202122430020.

The previous prime is 202122429979. The next prime is 202122430049. The reversal of 202122430021 is 120034221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200963027521 + 1159402500 = 448289^2 + 34050^2 .

It is a cyclic number.

It is not a de Polignac number, because 202122430021 - 2³¹ = 199974946373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202122430921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101061215010 + 101061215011.

It is an arithmetic number, because the mean of its divisors is an integer number (101061215011).

Almost surely, 2^202122430021 is an apocalyptic number.

It is an amenable number.

202122430021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202122430021 is an equidigital number, since it uses as much as digits as its factorization.

202122430021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 202122430021 its reverse (120034221202), we get a palindrome (322156651223).

The spelling of 202122430021 in words is "two hundred two billion, one hundred twenty-two million, four hundred thirty thousand, twenty-one".