21222011123 has 8 divisors (see below), whose sum is σ = 22218310800. Its totient is φ = 20243345248.

The previous prime is 21222011119. The next prime is 21222011141. The reversal of 21222011123 is 32111022212.

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 21222011123 - 2² = 21222011119 is a prime.

It is a super-2 number, since 2×21222011123² (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 (21222011143) 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 in 7 ways as a sum of consecutive naturals, for example, 4405988 + ... + 4410801.

It is an arithmetic number, because the mean of its divisors is an integer number (2777288850).

Almost surely, 2^21222011123 is an apocalyptic number.

21222011123 is a deficient number, since it is larger than the sum of its proper divisors (996299677).

21222011123 is an equidigital number, since it uses as much as digits as its factorization.

21222011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8816901.

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

Adding to 21222011123 its reverse (32111022212), we get a palindrome (53333033335).

The spelling of 21222011123 in words is "twenty-one billion, two hundred twenty-two million, eleven thousand, one hundred twenty-three".