21121212111071 has 2 divisors, whose sum is σ = 21121212111072. Its totient is φ = 21121212111070.

The previous prime is 21121212111031. The next prime is 21121212111119. The reversal of 21121212111071 is 17011121212112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121212111071 - 2²⁶ = 21121145002207 is a prime.

It is a super-2 number, since 2×21121212111071² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121212111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560606055535 + 10560606055536.

It is an arithmetic number, because the mean of its divisors is an integer number (10560606055536).

Almost surely, 2^{21121212111071} is an apocalyptic number.

21121212111071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121212111071 is an equidigital number, since it uses as much as digits as its factorization.

21121212111071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 23.

Adding to 21121212111071 its reverse (17011121212112), we get a palindrome (38132333323183).

The spelling of 21121212111071 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, seventy-one".