21011022110123 has 2 divisors, whose sum is σ = 21011022110124. Its totient is φ = 21011022110122.

The previous prime is 21011022110101. The next prime is 21011022110137. The reversal of 21011022110123 is 32101122011012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011022110123 - 2²⁶ = 21010955001259 is a prime.

It is a super-2 number, since 2×21011022110123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21011022110423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505511055061 + 10505511055062.

It is an arithmetic number, because the mean of its divisors is an integer number (10505511055062).

Almost surely, 2^{21011022110123} is an apocalyptic number.

21011022110123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011022110123 is an equidigital number, since it uses as much as digits as its factorization.

21011022110123 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 17.

Adding to 21011022110123 its reverse (32101122011012), we get a palindrome (53112144121135).

The spelling of 21011022110123 in words is "twenty-one trillion, eleven billion, twenty-two million, one hundred ten thousand, one hundred twenty-three".