151221345 has 32 divisors (see below), whose sum is σ = 267909120. Its totient is φ = 72219840.

The previous prime is 151221299. The next prime is 151221347. The reversal of 151221345 is 543122151.

It is a happy number.

It is not a de Polignac number, because 151221345 - 2²⁰ = 150172769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (151221347) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4216 + ... + 17894.

It is an arithmetic number, because the mean of its divisors is an integer number (8372160).

Almost surely, 2^151221345 is an apocalyptic number.

151221345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

151221345 is a deficient number, since it is larger than the sum of its proper divisors (116687775).

151221345 is a wasteful number, since it uses less digits than its factorization.

151221345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13765.

The product of its digits is 1200, while the sum is 24.

The square root of 151221345 is about 12297.2088296491. The cubic root of 151221345 is about 532.7674690603.

Adding to 151221345 its reverse (543122151), we get a palindrome (694343496).

The spelling of 151221345 in words is "one hundred fifty-one million, two hundred twenty-one thousand, three hundred forty-five".