72241021 has 8 divisors (see below), whose sum is σ = 77662080. Its totient is φ = 66981888.

The previous prime is 72241003. The next prime is 72241031. The reversal of 72241021 is 12014227.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72241021 - 2¹¹ = 72238973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72241021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72241031) 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, 39556 + ... + 41341.

It is an arithmetic number, because the mean of its divisors is an integer number (9707760).

Almost surely, 2^72241021 is an apocalyptic number.

It is an amenable number.

72241021 is a deficient number, since it is larger than the sum of its proper divisors (5421059).

72241021 is a wasteful number, since it uses less digits than its factorization.

72241021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80963.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 72241021 is about 8499.4718071184. The cubic root of 72241021 is about 416.4804548906.

Adding to 72241021 its reverse (12014227), we get a palindrome (84255248).

The spelling of 72241021 in words is "seventy-two million, two hundred forty-one thousand, twenty-one".