151722221 has 8 divisors (see below), whose sum is σ = 174089664. Its totient is φ = 129528000.

The previous prime is 151722209. The next prime is 151722227. The reversal of 151722221 is 122227151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 151722221 - 2²⁶ = 84613357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151722227) 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 7 ways as a sum of consecutive naturals, for example, 41420 + ... + 44933.

It is an arithmetic number, because the mean of its divisors is an integer number (21761208).

Almost surely, 2^151722221 is an apocalyptic number.

It is an amenable number.

151722221 is a deficient number, since it is larger than the sum of its proper divisors (22367443).

151722221 is an equidigital number, since it uses as much as digits as its factorization.

151722221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86611.

The product of its digits is 560, while the sum is 23.

The square root of 151722221 is about 12317.5574283216. The cubic root of 151722221 is about 533.3550324071.

Adding to 151722221 its reverse (122227151), we get a palindrome (273949372).

The spelling of 151722221 in words is "one hundred fifty-one million, seven hundred twenty-two thousand, two hundred twenty-one".