21811438087883 has 2 divisors, whose sum is σ = 21811438087884. Its totient is φ = 21811438087882.

The previous prime is 21811438087867. The next prime is 21811438087913. The reversal of 21811438087883 is 38878083411812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21811438087883 - 2⁴ = 21811438087867 is a prime.

It is not a weakly prime, because it can be changed into another prime (21811438087843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10905719043941 + 10905719043942.

It is an arithmetic number, because the mean of its divisors is an integer number (10905719043942).

Almost surely, 2^{21811438087883} is an apocalyptic number.

21811438087883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21811438087883 is an equidigital number, since it uses as much as digits as its factorization.

21811438087883 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16515072, while the sum is 62.

The spelling of 21811438087883 in words is "twenty-one trillion, eight hundred eleven billion, four hundred thirty-eight million, eighty-seven thousand, eight hundred eighty-three".