21130033609 has 2 divisors, whose sum is σ = 21130033610. Its totient is φ = 21130033608.

The previous prime is 21130033531. The next prime is 21130033619. The reversal of 21130033609 is 90633003112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12320334009 + 8809699600 = 110997^2 + 93860^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130033609 - 2¹³ = 21130025417 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130033619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565016804 + 10565016805.

It is an arithmetic number, because the mean of its divisors is an integer number (10565016805).

Almost surely, 2^21130033609 is an apocalyptic number.

It is an amenable number.

21130033609 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130033609 is an equidigital number, since it uses as much as digits as its factorization.

21130033609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 21130033609 in words is "twenty-one billion, one hundred thirty million, thirty-three thousand, six hundred nine".