21020211001187 has 2 divisors, whose sum is σ = 21020211001188. Its totient is φ = 21020211001186.

The previous prime is 21020211001177. The next prime is 21020211001213. The reversal of 21020211001187 is 78110011202012.

It is a happy number.

It is an a-pointer prime, because the next prime (21020211001213) can be obtained adding 21020211001187 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020211001187 - 2⁸ = 21020211000931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020211001157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510105500593 + 10510105500594.

It is an arithmetic number, because the mean of its divisors is an integer number (10510105500594).

Almost surely, 2^{21020211001187} is an apocalyptic number.

21020211001187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020211001187 is an equidigital number, since it uses as much as digits as its factorization.

21020211001187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 21020211001187 its reverse (78110011202012), we get a palindrome (99130222203199).

The spelling of 21020211001187 in words is "twenty-one trillion, twenty billion, two hundred eleven million, one thousand, one hundred eighty-seven".