10020421391 has 2 divisors, whose sum is σ = 10020421392. Its totient is φ = 10020421390.

The previous prime is 10020421373. The next prime is 10020421399. The reversal of 10020421391 is 19312402001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10020421391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10020421399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010210695 + 5010210696.

It is an arithmetic number, because the mean of its divisors is an integer number (5010210696).

Almost surely, 2^10020421391 is an apocalyptic number.

10020421391 is a deficient number, since it is larger than the sum of its proper divisors (1).

10020421391 is an equidigital number, since it uses as much as digits as its factorization.

10020421391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 10020421391 its reverse (19312402001), we get a palindrome (29332823392).

The spelling of 10020421391 in words is "ten billion, twenty million, four hundred twenty-one thousand, three hundred ninety-one".