21103033087 has 2 divisors, whose sum is σ = 21103033088. Its totient is φ = 21103033086.

The previous prime is 21103032983. The next prime is 21103033099. The reversal of 21103033087 is 78033030112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103033087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103093087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551516543 + 10551516544.

It is an arithmetic number, because the mean of its divisors is an integer number (10551516544).

Almost surely, 2^21103033087 is an apocalyptic number.

21103033087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103033087 is an equidigital number, since it uses as much as digits as its factorization.

21103033087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

Adding to 21103033087 its reverse (78033030112), we get a palindrome (99136063199).

The spelling of 21103033087 in words is "twenty-one billion, one hundred three million, thirty-three thousand, eighty-seven".