21111032087 has 2 divisors, whose sum is σ = 21111032088. Its totient is φ = 21111032086.

The previous prime is 21111032083. The next prime is 21111032141. The reversal of 21111032087 is 78023011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111032087 - 2² = 21111032083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111032083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555516043 + 10555516044.

It is an arithmetic number, because the mean of its divisors is an integer number (10555516044).

Almost surely, 2^21111032087 is an apocalyptic number.

21111032087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111032087 is an equidigital number, since it uses as much as digits as its factorization.

21111032087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

Adding to 21111032087 its reverse (78023011112), we get a palindrome (99134043199).

The spelling of 21111032087 in words is "twenty-one billion, one hundred eleven million, thirty-two thousand, eighty-seven".