71850121021 has 8 divisors (see below), whose sum is σ = 84024062144. Its totient is φ = 60153589440.

The previous prime is 71850120997. The next prime is 71850121043. The reversal of 71850121021 is 12012105817.

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

It is a de Polignac number, because none of the positive numbers 2^k-71850121021 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 (71850121081) 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, 119352060 + ... + 119352661.

It is an arithmetic number, because the mean of its divisors is an integer number (10503007768).

Almost surely, 2^71850121021 is an apocalyptic number.

It is an amenable number.

71850121021 is a deficient number, since it is larger than the sum of its proper divisors (12173941123).

71850121021 is a wasteful number, since it uses less digits than its factorization.

71850121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238704771.

The product of its (nonzero) digits is 1120, while the sum is 28.

Adding to 71850121021 its reverse (12012105817), we get a palindrome (83862226838).

The spelling of 71850121021 in words is "seventy-one billion, eight hundred fifty million, one hundred twenty-one thousand, twenty-one".