21020110087 has 2 divisors, whose sum is σ = 21020110088. Its totient is φ = 21020110086.

The previous prime is 21020110063. The next prime is 21020110091. The reversal of 21020110087 is 78001102012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020110087 - 2¹⁵ = 21020077319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020110057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510055043 + 10510055044.

It is an arithmetic number, because the mean of its divisors is an integer number (10510055044).

Almost surely, 2^21020110087 is an apocalyptic number.

21020110087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020110087 is an equidigital number, since it uses as much as digits as its factorization.

21020110087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 21020110087 its reverse (78001102012), we get a palindrome (99021212099).

The spelling of 21020110087 in words is "twenty-one billion, twenty million, one hundred ten thousand, eighty-seven".