21022112123 has 8 divisors (see below), whose sum is σ = 21263009040. Its totient is φ = 20781319680.

The previous prime is 21022112117. The next prime is 21022112143. The reversal of 21022112123 is 32121122012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022112123 - 2²⁴ = 21005334907 is a prime.

It is a super-2 number, since 2×21022112123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022112143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422411 + ... + 469547.

It is an arithmetic number, because the mean of its divisors is an integer number (2657876130).

Almost surely, 2^21022112123 is an apocalyptic number.

21022112123 is a deficient number, since it is larger than the sum of its proper divisors (240896917).

21022112123 is an equidigital number, since it uses as much as digits as its factorization.

21022112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52237.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21022112123 its reverse (32121122012), we get a palindrome (53143234135).

The spelling of 21022112123 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, one hundred twenty-three".