151221224 has 64 divisors (see below), whose sum is σ = 364953600. Its totient is φ = 57009600.

The previous prime is 151221223. The next prime is 151221229. The reversal of 151221224 is 422122151.

It is a junction number, because it is equal to n+sod(n) for n = 151221196 and 151221205.

It is not an unprimeable number, because it can be changed into a prime (151221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15137 + ... + 23055.

It is an arithmetic number, because the mean of its divisors is an integer number (5702400).

Almost surely, 2^151221224 is an apocalyptic number.

151221224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 151221224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182476800).

151221224 is an abundant number, since it is smaller than the sum of its proper divisors (213732376).

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

151221224 is a wasteful number, since it uses less digits than its factorization.

151221224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7974 (or 7970 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 151221224 is about 12297.2039098325. The cubic root of 151221224 is about 532.7673269620.

Adding to 151221224 its reverse (422122151), we get a palindrome (573343375).

The spelling of 151221224 in words is "one hundred fifty-one million, two hundred twenty-one thousand, two hundred twenty-four".