21112011110387 has 2 divisors, whose sum is σ = 21112011110388. Its totient is φ = 21112011110386.

The previous prime is 21112011110383. The next prime is 21112011110417. The reversal of 21112011110387 is 78301111021112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112011110387 - 2² = 21112011110383 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112011110383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556005555193 + 10556005555194.

It is an arithmetic number, because the mean of its divisors is an integer number (10556005555194).

Almost surely, 2^{21112011110387} is an apocalyptic number.

21112011110387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112011110387 is an equidigital number, since it uses as much as digits as its factorization.

21112011110387 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 29.

Adding to 21112011110387 its reverse (78301111021112), we get a palindrome (99413122131499).

The spelling of 21112011110387 in words is "twenty-one trillion, one hundred twelve billion, eleven million, one hundred ten thousand, three hundred eighty-seven".