20531321099 has 2 divisors, whose sum is σ = 20531321100. Its totient is φ = 20531321098.

The previous prime is 20531321071. The next prime is 20531321119. The reversal of 20531321099 is 99012313502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20531321099 - 2¹² = 20531317003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531321399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265660549 + 10265660550.

It is an arithmetic number, because the mean of its divisors is an integer number (10265660550).

Almost surely, 2^20531321099 is an apocalyptic number.

20531321099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531321099 is an equidigital number, since it uses as much as digits as its factorization.

20531321099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The spelling of 20531321099 in words is "twenty billion, five hundred thirty-one million, three hundred twenty-one thousand, ninety-nine".