72150221 has 8 divisors (see below), whose sum is σ = 84764064. Its totient is φ = 60545520.

The previous prime is 72150203. The next prime is 72150229. The reversal of 72150221 is 12205127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72150221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72150193 and 72150202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72150229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252131 + ... + 252416.

It is an arithmetic number, because the mean of its divisors is an integer number (10595508).

Almost surely, 2^72150221 is an apocalyptic number.

It is an amenable number.

72150221 is a deficient number, since it is larger than the sum of its proper divisors (12613843).

72150221 is a wasteful number, since it uses less digits than its factorization.

72150221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504571.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 72150221 is about 8494.1286192287. The cubic root of 72150221 is about 416.3058898041.

Adding to 72150221 its reverse (12205127), we get a palindrome (84355348).

The spelling of 72150221 in words is "seventy-two million, one hundred fifty thousand, two hundred twenty-one".