21034211087 has 2 divisors, whose sum is σ = 21034211088. Its totient is φ = 21034211086.

The previous prime is 21034211069. The next prime is 21034211111. The reversal of 21034211087 is 78011243012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21034211087 - 2¹⁰ = 21034210063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21034211587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517105543 + 10517105544.

It is an arithmetic number, because the mean of its divisors is an integer number (10517105544).

Almost surely, 2^21034211087 is an apocalyptic number.

21034211087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034211087 is an equidigital number, since it uses as much as digits as its factorization.

21034211087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 21034211087 its reverse (78011243012), we get a palindrome (99045454099).

The spelling of 21034211087 in words is "twenty-one billion, thirty-four million, two hundred eleven thousand, eighty-seven".