211221022139 has 2 divisors, whose sum is σ = 211221022140. Its totient is φ = 211221022138.

The previous prime is 211221022093. The next prime is 211221022141. The reversal of 211221022139 is 931220122112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211221022139 - 2²⁰ = 211219973563 is a prime.

It is a super-2 number, since 2×211221022139² (a number of 23 digits) contains 22 as substring.

Together with 211221022141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211221022939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610511069 + 105610511070.

It is an arithmetic number, because the mean of its divisors is an integer number (105610511070).

Almost surely, 2^211221022139 is an apocalyptic number.

211221022139 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221022139 is an equidigital number, since it uses as much as digits as its factorization.

211221022139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 211221022139 in words is "two hundred eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred thirty-nine".