21122838833 has 2 divisors, whose sum is σ = 21122838834. Its totient is φ = 21122838832.

The previous prime is 21122838829. The next prime is 21122838871. The reversal of 21122838833 is 33883822112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16479370384 + 4643468449 = 128372^2 + 68143^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122838833 - 2² = 21122838829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21122838823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561419416 + 10561419417.

It is an arithmetic number, because the mean of its divisors is an integer number (10561419417).

Almost surely, 2^21122838833 is an apocalyptic number.

It is an amenable number.

21122838833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122838833 is an equidigital number, since it uses as much as digits as its factorization.

21122838833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The spelling of 21122838833 in words is "twenty-one billion, one hundred twenty-two million, eight hundred thirty-eight thousand, eight hundred thirty-three".