72121271 has 2 divisors, whose sum is σ = 72121272. Its totient is φ = 72121270.

The previous prime is 72121237. The next prime is 72121331. The reversal of 72121271 is 17212127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72121271 - 2¹⁴ = 72104887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36060635 + 36060636.

It is an arithmetic number, because the mean of its divisors is an integer number (36060636).

Almost surely, 2^72121271 is an apocalyptic number.

72121271 is a deficient number, since it is larger than the sum of its proper divisors (1).

72121271 is an equidigital number, since it uses as much as digits as its factorization.

72121271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392, while the sum is 23.

The square root of 72121271 is about 8492.4243299543. The cubic root of 72121271 is about 416.2502019736.

Adding to 72121271 its reverse (17212127), we get a palindrome (89333398).

The spelling of 72121271 in words is "seventy-two million, one hundred twenty-one thousand, two hundred seventy-one".