10020637421 has 2 divisors, whose sum is σ = 10020637422. Its totient is φ = 10020637420.

The previous prime is 10020637343. The next prime is 10020637423. The reversal of 10020637421 is 12473602001.

10020637421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8829421225 + 1191216196 = 93965^2 + 34514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10020637421 is a prime.

Together with 10020637423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10020637423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010318710 + 5010318711.

It is an arithmetic number, because the mean of its divisors is an integer number (5010318711).

Almost surely, 2^10020637421 is an apocalyptic number.

It is an amenable number.

10020637421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10020637421 is an equidigital number, since it uses as much as digits as its factorization.

10020637421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The spelling of 10020637421 in words is "ten billion, twenty million, six hundred thirty-seven thousand, four hundred twenty-one".