971211212222213 has 4 divisors (see below), whose sum is σ = 1028341283529420. Its totient is φ = 914081140915008.

The previous prime is 971211212222161. The next prime is 971211212222239. The reversal of 971211212222213 is 312222212112179.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 665744081268289 + 305467130953924 = 25802017^2 + 17477618^2 .

It is a cyclic number.

It is not a de Polignac number, because 971211212222213 - 2⁶ = 971211212222149 is a prime.

It is a super-2 number, since 2×971211212222213² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971211212222263) 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, 28565035653578 + ... + 28565035653611.

It is an arithmetic number, because the mean of its divisors is an integer number (257085320882355).

Almost surely, 2^{971211212222213} is an apocalyptic number.

It is an amenable number.

971211212222213 is a deficient number, since it is larger than the sum of its proper divisors (57130071307207).

971211212222213 is a wasteful number, since it uses less digits than its factorization.

971211212222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57130071307206.

The product of its digits is 24192, while the sum is 38.

The spelling of 971211212222213 in words is "nine hundred seventy-one trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-two thousand, two hundred thirteen".