21041010826109 has 2 divisors, whose sum is σ = 21041010826110. Its totient is φ = 21041010826108.

The previous prime is 21041010826067. The next prime is 21041010826177. The reversal of 21041010826109 is 90162801014012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19140817500484 + 1900193325625 = 4375022^2 + 1378475^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041010826109 - 2³² = 21036715858813 is a prime.

It is a super-2 number, since 2×21041010826109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041010823109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520505413054 + 10520505413055.

It is an arithmetic number, because the mean of its divisors is an integer number (10520505413055).

Almost surely, 2^{21041010826109} is an apocalyptic number.

It is an amenable number.

21041010826109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041010826109 is an equidigital number, since it uses as much as digits as its factorization.

21041010826109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 21041010826109 in words is "twenty-one trillion, forty-one billion, ten million, eight hundred twenty-six thousand, one hundred nine".