20213122439 has 2 divisors, whose sum is σ = 20213122440. Its totient is φ = 20213122438.

The previous prime is 20213122427. The next prime is 20213122441. The reversal of 20213122439 is 93422131202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20213122439 - 2⁸ = 20213122183 is a prime.

Together with 20213122441, 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 (20213122739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106561219 + 10106561220.

It is an arithmetic number, because the mean of its divisors is an integer number (10106561220).

Almost surely, 2^20213122439 is an apocalyptic number.

20213122439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213122439 is an equidigital number, since it uses as much as digits as its factorization.

20213122439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20213122439 in words is "twenty billion, two hundred thirteen million, one hundred twenty-two thousand, four hundred thirty-nine".