71212100102221 has 8 divisors (see below), whose sum is σ = 76737264252824. Its totient is φ = 65693694565440.

The previous prime is 71212100102219. The next prime is 71212100102239. The reversal of 71212100102221 is 12220100121217.

It can be written as a sum of positive squares in 4 ways, for example, as 23687552724196 + 47524547378025 = 4866986^2 + 6893805^2 .

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 71212100102221 - 2¹ = 71212100102219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71212100102192 and 71212100102201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71212100102201) 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, 1689631566 + ... + 1689673711.

It is an arithmetic number, because the mean of its divisors is an integer number (9592158031603).

Almost surely, 2^{71212100102221} is an apocalyptic number.

It is an amenable number.

71212100102221 is a deficient number, since it is larger than the sum of its proper divisors (5525164150603).

71212100102221 is a wasteful number, since it uses less digits than its factorization.

71212100102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379306911.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 71212100102221 its reverse (12220100121217), we get a palindrome (83432200223438).

The spelling of 71212100102221 in words is "seventy-one trillion, two hundred twelve billion, one hundred million, one hundred two thousand, two hundred twenty-one".