151211220 has 144 divisors (see below), whose sum is σ = 457954560. Its totient is φ = 37218048.

The previous prime is 151211189. The next prime is 151211257. The reversal of 151211220 is 22112151.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 151211220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3217237 + ... + 3217283.

It is an arithmetic number, because the mean of its divisors is an integer number (3180240).

Almost surely, 2^151211220 is an apocalyptic number.

151211220 is a gapful number since it is divisible by the number (10) 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 151211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228977280).

151211220 is an abundant number, since it is smaller than the sum of its proper divisors (306743340).

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

151211220 is a wasteful number, since it uses less digits than its factorization.

151211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 151211220 is about 12296.7971439721. The cubic root of 151211220 is about 532.7555783425.

Adding to 151211220 its reverse (22112151), we get a palindrome (173323371).

The spelling of 151211220 in words is "one hundred fifty-one million, two hundred eleven thousand, two hundred twenty".