21211222222124 has 48 divisors (see below), whose sum is σ = 40839065272320. Its totient is φ = 9559439285760.

The previous prime is 21211222222123. The next prime is 21211222222139. The reversal of 21211222222124 is 42122222211212.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21211222222093 and 21211222222102.

It is not an unprimeable number, because it can be changed into a prime (21211222222123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7545212 + ... + 9967580.

It is an arithmetic number, because the mean of its divisors is an integer number (850813859840).

Almost surely, 2^{21211222222124} is an apocalyptic number.

It is an amenable number.

21211222222124 is a deficient number, since it is larger than the sum of its proper divisors (19627843050196).

21211222222124 is a wasteful number, since it uses less digits than its factorization.

21211222222124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424078 (or 2424076 counting only the distinct ones).

The product of its digits is 2048, while the sum is 26.

Adding to 21211222222124 its reverse (42122222211212), we get a palindrome (63333444433336).

The spelling of 21211222222124 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-four".