151221015 has 24 divisors (see below), whose sum is σ = 285946128. Its totient is φ = 73319040.

The previous prime is 151220977. The next prime is 151221017. The reversal of 151221015 is 510122151.

It is not a de Polignac number, because 151221015 - 2¹⁹ = 150696727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151221017) 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 23 ways as a sum of consecutive naturals, for example, 152254 + ... + 153243.

It is an arithmetic number, because the mean of its divisors is an integer number (11914422).

Almost surely, 2^151221015 is an apocalyptic number.

151221015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

151221015 is a deficient number, since it is larger than the sum of its proper divisors (134725113).

151221015 is a wasteful number, since it uses less digits than its factorization.

151221015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305519 (or 305516 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 151221015 is about 12297.1954119628. The cubic root of 151221015 is about 532.7670815194.

Adding to 151221015 its reverse (510122151), we get a palindrome (661343166).

The spelling of 151221015 in words is "one hundred fifty-one million, two hundred twenty-one thousand, fifteen".