21122838871 has 2 divisors, whose sum is σ = 21122838872. Its totient is φ = 21122838870.

The previous prime is 21122838833. The next prime is 21122838907. The reversal of 21122838871 is 17883822112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122838871 - 2⁷ = 21122838743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122838571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561419435 + 10561419436.

It is an arithmetic number, because the mean of its divisors is an integer number (10561419436).

Almost surely, 2^21122838871 is an apocalyptic number.

21122838871 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122838871 is an equidigital number, since it uses as much as digits as its factorization.

21122838871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The spelling of 21122838871 in words is "twenty-one billion, one hundred twenty-two million, eight hundred thirty-eight thousand, eight hundred seventy-one".