71222001231221 has 4 divisors (see below), whose sum is σ = 71222056593600. Its totient is φ = 71221945868844.

The previous prime is 71222001231197. The next prime is 71222001231287. The reversal of 71222001231221 is 12213210022217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71222001231221 - 2³⁸ = 70947123324277 is a prime.

It is a super-3 number, since 3×71222001231221³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71222001231721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25704431 + ... + 28340108.

It is an arithmetic number, because the mean of its divisors is an integer number (17805514148400).

Almost surely, 2^{71222001231221} is an apocalyptic number.

It is an amenable number.

71222001231221 is a deficient number, since it is larger than the sum of its proper divisors (55362379).

71222001231221 is a wasteful number, since it uses less digits than its factorization.

71222001231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55362378.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 71222001231221 its reverse (12213210022217), we get a palindrome (83435211253438).

The spelling of 71222001231221 in words is "seventy-one trillion, two hundred twenty-two billion, one million, two hundred thirty-one thousand, two hundred twenty-one".