10203042721 has 2 divisors, whose sum is σ = 10203042722. Its totient is φ = 10203042720.

The previous prime is 10203042683. The next prime is 10203042727. The reversal of 10203042721 is 12724030201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6230892096 + 3972150625 = 78936^2 + 63025^2 .

It is an emirp because it is prime and its reverse (12724030201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10203042721 - 2⁷ = 10203042593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10203042692 and 10203042701.

It is not a weakly prime, because it can be changed into another prime (10203042727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101521360 + 5101521361.

It is an arithmetic number, because the mean of its divisors is an integer number (5101521361).

Almost surely, 2^10203042721 is an apocalyptic number.

It is an amenable number.

10203042721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10203042721 is an equidigital number, since it uses as much as digits as its factorization.

10203042721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 10203042721 its reverse (12724030201), we get a palindrome (22927072922).

The spelling of 10203042721 in words is "ten billion, two hundred three million, forty-two thousand, seven hundred twenty-one".