71211442021 has 8 divisors (see below), whose sum is σ = 75218088704. Its totient is φ = 67311639360.

The previous prime is 71211442007. The next prime is 71211442051. The reversal of 71211442021 is 12024411217.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71211442021 - 2⁷ = 71211441893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71211442051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26709636 + ... + 26712301.

It is an arithmetic number, because the mean of its divisors is an integer number (9402261088).

Almost surely, 2^71211442021 is an apocalyptic number.

It is an amenable number.

71211442021 is a deficient number, since it is larger than the sum of its proper divisors (4006646683).

71211442021 is a wasteful number, since it uses less digits than its factorization.

71211442021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53422011.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 71211442021 its reverse (12024411217), we get a palindrome (83235853238).

The spelling of 71211442021 in words is "seventy-one billion, two hundred eleven million, four hundred forty-two thousand, twenty-one".