21222221233123 has 2 divisors, whose sum is σ = 21222221233124. Its totient is φ = 21222221233122.

The previous prime is 21222221233121. The next prime is 21222221233139. The reversal of 21222221233123 is 32133212222212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222221233123 - 2¹ = 21222221233121 is a prime.

Together with 21222221233121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21222221233091 and 21222221233100.

It is not a weakly prime, because it can be changed into another prime (21222221233121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611110616561 + 10611110616562.

It is an arithmetic number, because the mean of its divisors is an integer number (10611110616562).

Almost surely, 2^{21222221233123} is an apocalyptic number.

21222221233123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222221233123 is an equidigital number, since it uses as much as digits as its factorization.

21222221233123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

Adding to 21222221233123 its reverse (32133212222212), we get a palindrome (53355433455335).

It can be divided in two parts, 2122222 and 1233123, that added together give a triangular number (3355345 = T₂₅₉₀).

The spelling of 21222221233123 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred thirty-three thousand, one hundred twenty-three".