21121233212089 has 2 divisors, whose sum is σ = 21121233212090. Its totient is φ = 21121233212088.

The previous prime is 21121233212069. The next prime is 21121233212141. The reversal of 21121233212089 is 98021233212112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10653957121600 + 10467276090489 = 3264040^2 + 3235317^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121233212089 - 2⁷ = 21121233211961 is a prime.

It is a super-2 number, since 2×21121233212089² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121233212069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560616606044 + 10560616606045.

It is an arithmetic number, because the mean of its divisors is an integer number (10560616606045).

Almost surely, 2^{21121233212089} is an apocalyptic number.

It is an amenable number.

21121233212089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121233212089 is an equidigital number, since it uses as much as digits as its factorization.

21121233212089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 21121233212089 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred thirty-three million, two hundred twelve thousand, eighty-nine".