10091009021 has 2 divisors, whose sum is σ = 10091009022. Its totient is φ = 10091009020.

The previous prime is 10091008999. The next prime is 10091009101. The reversal of 10091009021 is 12090019001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7937028100 + 2153980921 = 89090^2 + 46411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10091009021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10091009221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045504510 + 5045504511.

It is an arithmetic number, because the mean of its divisors is an integer number (5045504511).

Almost surely, 2^10091009021 is an apocalyptic number.

It is an amenable number.

10091009021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10091009021 is an equidigital number, since it uses as much as digits as its factorization.

10091009021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 10091009021 in words is "ten billion, ninety-one million, nine thousand, twenty-one".