20121132224 has 56 divisors (see below), whose sum is σ = 40307532288. Its totient is φ = 9965168640.

The previous prime is 20121132191. The next prime is 20121132257. The reversal of 20121132224 is 42223112102.

It is an interprime number because it is at equal distance from previous prime (20121132191) and next prime (20121132257).

It is a junction number, because it is equal to n+sod(n) for n = 20121132196 and 20121132205.

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, 6183782 + ... + 6187034.

Almost surely, 2^20121132224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121132224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20153766144).

20121132224 is an abundant number, since it is smaller than the sum of its proper divisors (20186400064).

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

20121132224 is a wasteful number, since it uses less digits than its factorization.

20121132224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153 (or 4143 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20121132224 its reverse (42223112102), we get a palindrome (62344244326).

The spelling of 20121132224 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty-four".