10121223421 has 2 divisors, whose sum is σ = 10121223422. Its totient is φ = 10121223420.

The previous prime is 10121223419. The next prime is 10121223461. The reversal of 10121223421 is 12432212101.

10121223421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9008667396 + 1112556025 = 94914^2 + 33355^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121223421 - 2¹ = 10121223419 is a prime.

Together with 10121223419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10121223461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060611710 + 5060611711.

It is an arithmetic number, because the mean of its divisors is an integer number (5060611711).

Almost surely, 2^10121223421 is an apocalyptic number.

It is an amenable number.

10121223421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121223421 is an equidigital number, since it uses as much as digits as its factorization.

10121223421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 10121223421 its reverse (12432212101), we get a palindrome (22553435522).

The spelling of 10121223421 in words is "ten billion, one hundred twenty-one million, two hundred twenty-three thousand, four hundred twenty-one".