71432121 has 4 divisors (see below), whose sum is σ = 95242832. Its totient is φ = 47621412.

The previous prime is 71432107. The next prime is 71432129. The reversal of 71432121 is 12123417.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12123417 = 3 ⋅4041139.

It is not a de Polignac number, because 71432121 - 2⁷ = 71431993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71432129) 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, 11905351 + ... + 11905356.

It is an arithmetic number, because the mean of its divisors is an integer number (23810708).

Almost surely, 2^71432121 is an apocalyptic number.

It is an amenable number.

71432121 is a deficient number, since it is larger than the sum of its proper divisors (23810711).

71432121 is a wasteful number, since it uses less digits than its factorization.

71432121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23810710.

The product of its digits is 336, while the sum is 21.

The square root of 71432121 is about 8451.7525401540. The cubic root of 71432121 is about 414.9201394692.

Adding to 71432121 its reverse (12123417), we get a palindrome (83555538).

The spelling of 71432121 in words is "seventy-one million, four hundred thirty-two thousand, one hundred twenty-one".