71421121 has 2 divisors, whose sum is σ = 71421122. Its totient is φ = 71421120.

The previous prime is 71421067. The next prime is 71421143. The reversal of 71421121 is 12112417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71166096 + 255025 = 8436^2 + 505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71421121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71421191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35710560 + 35710561.

It is an arithmetic number, because the mean of its divisors is an integer number (35710561).

Almost surely, 2^71421121 is an apocalyptic number.

It is an amenable number.

71421121 is a deficient number, since it is larger than the sum of its proper divisors (1).

71421121 is an equidigital number, since it uses as much as digits as its factorization.

71421121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112, while the sum is 19.

The square root of 71421121 is about 8451.1017624923. The cubic root of 71421121 is about 414.8988402005.

Adding to 71421121 its reverse (12112417), we get a palindrome (83533538).

The spelling of 71421121 in words is "seventy-one million, four hundred twenty-one thousand, one hundred twenty-one".