21100099087 has 2 divisors, whose sum is σ = 21100099088. Its totient is φ = 21100099086.

The previous prime is 21100099079. The next prime is 21100099091. The reversal of 21100099087 is 78099000112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100099087 - 2³ = 21100099079 is a prime.

It is a super-3 number, since 3×21100099087³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100099057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550049543 + 10550049544.

It is an arithmetic number, because the mean of its divisors is an integer number (10550049544).

Almost surely, 2^21100099087 is an apocalyptic number.

21100099087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100099087 is an equidigital number, since it uses as much as digits as its factorization.

21100099087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

Adding to 21100099087 its reverse (78099000112), we get a palindrome (99199099199).

The spelling of 21100099087 in words is "twenty-one billion, one hundred million, ninety-nine thousand, eighty-seven".