72221151 has 16 divisors (see below), whose sum is σ = 104717664. Its totient is φ = 44089344.

The previous prime is 72221143. The next prime is 72221153. The reversal of 72221151 is 15112227.

It is not a de Polignac number, because 72221151 - 2³ = 72221143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72221153) 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, 17250 + ... + 21023.

It is an arithmetic number, because the mean of its divisors is an integer number (6544854).

Almost surely, 2^72221151 is an apocalyptic number.

72221151 is a deficient number, since it is larger than the sum of its proper divisors (32496513).

72221151 is a wasteful number, since it uses less digits than its factorization.

72221151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38330.

The product of its digits is 280, while the sum is 21.

The square root of 72221151 is about 8498.3028305656. The cubic root of 72221151 is about 416.4422668668.

Adding to 72221151 its reverse (15112227), we get a palindrome (87333378).

It can be divided in two parts, 722211 and 51, that multiplied together give a square (36832761 = 6069²).

The spelling of 72221151 in words is "seventy-two million, two hundred twenty-one thousand, one hundred fifty-one".