2151121224 has 32 divisors (see below), whose sum is σ = 6146061120. Its totient is φ = 614606016.

The previous prime is 2151121187. The next prime is 2151121241. The reversal of 2151121224 is 4221211512.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 2151121224.

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, 6401979 + ... + 6402314.

It is an arithmetic number, because the mean of its divisors is an integer number (192064410).

Almost surely, 2^2151121224 is an apocalyptic number.

2151121224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2151121224 is an abundant number, since it is smaller than the sum of its proper divisors (3994939896).

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

2151121224 is a wasteful number, since it uses less digits than its factorization.

2151121224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804309 (or 12804305 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 2151121224 is about 46380.1813709261. The cubic root of 2151121224 is about 1290.8872017148.

Adding to 2151121224 its reverse (4221211512), we get a palindrome (6372332736).

The spelling of 2151121224 in words is "two billion, one hundred fifty-one million, one hundred twenty-one thousand, two hundred twenty-four".