21121202279 has 2 divisors, whose sum is σ = 21121202280. Its totient is φ = 21121202278.

The previous prime is 21121202177. The next prime is 21121202281. The reversal of 21121202279 is 97220212112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121202279 - 2⁸ = 21121202023 is a prime.

It is a super-2 number, since 2×21121202279² (a number of 21 digits) contains 22 as substring.

Together with 21121202281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121202779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560601139 + 10560601140.

It is an arithmetic number, because the mean of its divisors is an integer number (10560601140).

Almost surely, 2^21121202279 is an apocalyptic number.

21121202279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121202279 is an equidigital number, since it uses as much as digits as its factorization.

21121202279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 21121202279 in words is "twenty-one billion, one hundred twenty-one million, two hundred two thousand, two hundred seventy-nine".