72121241 has 4 divisors (see below), whose sum is σ = 72172800. Its totient is φ = 72069684.

The previous prime is 72121237. The next prime is 72121271. The reversal of 72121241 is 14212127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72121241 - 2² = 72121237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72121201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23621 + ... + 26498.

It is an arithmetic number, because the mean of its divisors is an integer number (18043200).

Almost surely, 2^72121241 is an apocalyptic number.

It is an amenable number.

72121241 is a deficient number, since it is larger than the sum of its proper divisors (51559).

72121241 is a wasteful number, since it uses less digits than its factorization.

72121241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51558.

The product of its digits is 224, while the sum is 20.

The square root of 72121241 is about 8492.4225636740. The cubic root of 72121241 is about 416.2501442583.

Adding to 72121241 its reverse (14212127), we get a palindrome (86333368).

The spelling of 72121241 in words is "seventy-two million, one hundred twenty-one thousand, two hundred forty-one".