20111221220024 has 32 divisors (see below), whose sum is σ = 41137312806000. Its totient is φ = 9141303313920.

The previous prime is 20111221220023. The next prime is 20111221220141. The reversal of 20111221220024 is 42002212211102.

It is a happy number.

It is a super-2 number, since 2×20111221220024² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111221219978 and 20111221220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111221220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3090974 + ... + 7055250.

Almost surely, 2^{20111221220024} is an apocalyptic number.

It is an amenable number.

20111221220024 is an abundant number, since it is smaller than the sum of its proper divisors (21026091585976).

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

20111221220024 is a wasteful number, since it uses less digits than its factorization.

20111221220024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021943 (or 4021939 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20111221220024 its reverse (42002212211102), we get a palindrome (62113433431126).

The spelling of 20111221220024 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, twenty-four".