20109232621 has 2 divisors, whose sum is σ = 20109232622. Its totient is φ = 20109232620.

The previous prime is 20109232589. The next prime is 20109232681. The reversal of 20109232621 is 12623290102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19158435396 + 950797225 = 138414^2 + 30835^2 .

It is a cyclic number.

It is not a de Polignac number, because 20109232621 - 2⁵ = 20109232589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20109232621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20109232681) 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, 10054616310 + 10054616311.

It is an arithmetic number, because the mean of its divisors is an integer number (10054616311).

Almost surely, 2^20109232621 is an apocalyptic number.

It is an amenable number.

20109232621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109232621 is an equidigital number, since it uses as much as digits as its factorization.

20109232621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 20109232621 in words is "twenty billion, one hundred nine million, two hundred thirty-two thousand, six hundred twenty-one".