21121022110879 has 2 divisors, whose sum is σ = 21121022110880. Its totient is φ = 21121022110878.

The previous prime is 21121022110829. The next prime is 21121022111009. The reversal of 21121022110879 is 97801122012112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121022110879 - 2⁷ = 21121022110751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121022110819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560511055439 + 10560511055440.

It is an arithmetic number, because the mean of its divisors is an integer number (10560511055440).

Almost surely, 2^{21121022110879} is an apocalyptic number.

21121022110879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121022110879 is an equidigital number, since it uses as much as digits as its factorization.

21121022110879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 37.

The spelling of 21121022110879 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, one hundred ten thousand, eight hundred seventy-nine".