71212021201 has 8 divisors (see below), whose sum is σ = 71302013640. Its totient is φ = 71122071552.

The previous prime is 71212021121. The next prime is 71212021211. The reversal of 71212021201 is 10212021217.

It can be written as a sum of positive squares in 4 ways, for example, as 35843576976 + 35368444225 = 189324^2 + 188065^2 .

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 71212021201 - 2⁷ = 71212021073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71212021211) 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, 4422501 + ... + 4438573.

It is an arithmetic number, because the mean of its divisors is an integer number (8912751705).

Almost surely, 2^71212021201 is an apocalyptic number.

It is an amenable number.

71212021201 is a deficient number, since it is larger than the sum of its proper divisors (89992439).

71212021201 is a wasteful number, since it uses less digits than its factorization.

71212021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21395.

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

Adding to 71212021201 its reverse (10212021217), we get a palindrome (81424042418).

The spelling of 71212021201 in words is "seventy-one billion, two hundred twelve million, twenty-one thousand, two hundred one".