21122024424 has 64 divisors (see below), whose sum is σ = 58001011200. Its totient is φ = 6380104896.

The previous prime is 21122024411. The next prime is 21122024477. The reversal of 21122024424 is 42442022112.

It is a happy number.

It is a super-2 number, since 2×21122024424² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21122024394 and 21122024403.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 996474 + ... + 1017449.

It is an arithmetic number, because the mean of its divisors is an integer number (906265800).

Almost surely, 2^21122024424 is an apocalyptic number.

21122024424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21122024424 is an abundant number, since it is smaller than the sum of its proper divisors (36878986776).

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

21122024424 is a wasteful number, since it uses less digits than its factorization.

21122024424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013974 (or 2013970 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21122024424 its reverse (42442022112), we get a palindrome (63564046536).

The spelling of 21122024424 in words is "twenty-one billion, one hundred twenty-two million, twenty-four thousand, four hundred twenty-four".