21022112021123 has 16 divisors (see below), whose sum is σ = 21091558118400. Its totient is φ = 20952776644800.

The previous prime is 21022112021117. The next prime is 21022112021147. The reversal of 21022112021123 is 32112021122012.

It is a cyclic number.

It is not a de Polignac number, because 21022112021123 - 2¹⁰ = 21022112020099 is a prime.

It is a super-2 number, since 2×21022112021123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022112021095 and 21022112021104.

It is not an unprimeable number, because it can be changed into a prime (21022112021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2067269183 + ... + 2067279351.

It is an arithmetic number, because the mean of its divisors is an integer number (1318222382400).

Almost surely, 2^{21022112021123} is an apocalyptic number.

21022112021123 is a deficient number, since it is larger than the sum of its proper divisors (69446097277).

21022112021123 is a wasteful number, since it uses less digits than its factorization.

21022112021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14962.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21022112021123 its reverse (32112021122012), we get a palindrome (53134133143135).

The spelling of 21022112021123 in words is "twenty-one trillion, twenty-two billion, one hundred twelve million, twenty-one thousand, one hundred twenty-three".