21010022123 has 2 divisors, whose sum is σ = 21010022124. Its totient is φ = 21010022122.

The previous prime is 21010022063. The next prime is 21010022153. The reversal of 21010022123 is 32122001012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010022123 - 2⁸ = 21010021867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010022098 and 21010022107.

It is not a weakly prime, because it can be changed into another prime (21010022153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505011061 + 10505011062.

It is an arithmetic number, because the mean of its divisors is an integer number (10505011062).

Almost surely, 2^21010022123 is an apocalyptic number.

21010022123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010022123 is an equidigital number, since it uses as much as digits as its factorization.

21010022123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21010022123 its reverse (32122001012), we get a palindrome (53132023135).

The spelling of 21010022123 in words is "twenty-one billion, ten million, twenty-two thousand, one hundred twenty-three".