202122010421 has 2 divisors, whose sum is σ = 202122010422. Its totient is φ = 202122010420.

The previous prime is 202122010403. The next prime is 202122010463. The reversal of 202122010421 is 124010221202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186736336900 + 15385673521 = 432130^2 + 124039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202122010421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202122010421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202122010481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101061005210 + 101061005211.

It is an arithmetic number, because the mean of its divisors is an integer number (101061005211).

Almost surely, 2^202122010421 is an apocalyptic number.

It is an amenable number.

202122010421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202122010421 is an equidigital number, since it uses as much as digits as its factorization.

202122010421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202122010421 its reverse (124010221202), we get a palindrome (326132231623).

The spelling of 202122010421 in words is "two hundred two billion, one hundred twenty-two million, ten thousand, four hundred twenty-one".