21121102221239 has 2 divisors, whose sum is σ = 21121102221240. Its totient is φ = 21121102221238.

The previous prime is 21121102221161. The next prime is 21121102221277. The reversal of 21121102221239 is 93212220112112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121102221239 - 2⁸ = 21121102220983 is a prime.

It is a super-2 number, since 2×21121102221239² (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 (21121102221299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560551110619 + 10560551110620.

It is an arithmetic number, because the mean of its divisors is an integer number (10560551110620).

Almost surely, 2^{21121102221239} is an apocalyptic number.

21121102221239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121102221239 is an equidigital number, since it uses as much as digits as its factorization.

21121102221239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 21121102221239 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand, two hundred thirty-nine".