71232021 has 16 divisors (see below), whose sum is σ = 120604800. Its totient is φ = 40703904.

The previous prime is 71231987. The next prime is 71232041. The reversal of 71232021 is 12023217.

It is not a de Polignac number, because 71232021 - 2¹⁰ = 71230997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71231985 and 71232003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71232041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188256 + ... + 188633.

It is an arithmetic number, because the mean of its divisors is an integer number (7537800).

Almost surely, 2^71232021 is an apocalyptic number.

It is an amenable number.

71232021 is a deficient number, since it is larger than the sum of its proper divisors (49372779).

71232021 is a wasteful number, since it uses less digits than its factorization.

71232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376905 (or 376899 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 71232021 is about 8439.9064568276. The cubic root of 71232021 is about 414.5323439649.

Adding to 71232021 its reverse (12023217), we get a palindrome (83255238).

The spelling of 71232021 in words is "seventy-one million, two hundred thirty-two thousand, twenty-one".