202122430921 has 2 divisors, whose sum is σ = 202122430922. Its totient is φ = 202122430920.

The previous prime is 202122430919. The next prime is 202122430931. The reversal of 202122430921 is 129034221202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167927024521 + 34195406400 = 409789^2 + 184920^2 .

It is a cyclic number.

It is not a de Polignac number, because 202122430921 - 2¹ = 202122430919 is a prime.

Together with 202122430919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 202122430921.

It is not a weakly prime, because it can be changed into another prime (202122430931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101061215460 + 101061215461.

It is an arithmetic number, because the mean of its divisors is an integer number (101061215461).

Almost surely, 2^202122430921 is an apocalyptic number.

It is an amenable number.

202122430921 is a deficient number, since it is larger than the sum of its proper divisors (1).

202122430921 is an equidigital number, since it uses as much as digits as its factorization.

202122430921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 202122430921 in words is "two hundred two billion, one hundred twenty-two million, four hundred thirty thousand, nine hundred twenty-one".