10211002120421 has 2 divisors, whose sum is σ = 10211002120422. Its totient is φ = 10211002120420.

The previous prime is 10211002120369. The next prime is 10211002120453. The reversal of 10211002120421 is 12402120011201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10112336400100 + 98665720321 = 3179990^2 + 314111^2 .

It is an emirp because it is prime and its reverse (12402120011201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211002120421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10211002120421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211002120481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105501060210 + 5105501060211.

It is an arithmetic number, because the mean of its divisors is an integer number (5105501060211).

Almost surely, 2^{10211002120421} is an apocalyptic number.

It is an amenable number.

10211002120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211002120421 is an equidigital number, since it uses as much as digits as its factorization.

10211002120421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10211002120421 its reverse (12402120011201), we get a palindrome (22613122131622).

The spelling of 10211002120421 in words is "ten trillion, two hundred eleven billion, two million, one hundred twenty thousand, four hundred twenty-one".