21223121124 has 24 divisors (see below), whose sum is σ = 49533543360. Its totient is φ = 7072526944.

The previous prime is 21223121119. The next prime is 21223121149. The reversal of 21223121124 is 42112132212.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21223121124.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182559 + ... + 275270.

It is an arithmetic number, because the mean of its divisors is an integer number (2063897640).

Almost surely, 2^21223121124 is an apocalyptic number.

It is an amenable number.

21223121124 is an abundant number, since it is smaller than the sum of its proper divisors (28310422236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223121124 is a wasteful number, since it uses less digits than its factorization.

21223121124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461699 (or 461697 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

Adding to 21223121124 its reverse (42112132212), we get a palindrome (63335253336).

The spelling of 21223121124 in words is "twenty-one billion, two hundred twenty-three million, one hundred twenty-one thousand, one hundred twenty-four".