211274157217 has 8 divisors (see below), whose sum is σ = 224678917800. Its totient is φ = 197977937664.

The previous prime is 211274157203. The next prime is 211274157271. The reversal of 211274157217 is 712751472112.

It can be written as a sum of positive squares in 4 ways, for example, as 79095375121 + 132178782096 = 281239^2 + 363564^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211274157217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211274157217.

It is not an unprimeable number, because it can be changed into a prime (211274157287) 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, 27131242 + ... + 27139027.

It is an arithmetic number, because the mean of its divisors is an integer number (28084864725).

Almost surely, 2^211274157217 is an apocalyptic number.

It is an amenable number.

211274157217 is a deficient number, since it is larger than the sum of its proper divisors (13404760583).

211274157217 is a wasteful number, since it uses less digits than its factorization.

211274157217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54270515.

The product of its digits is 54880, while the sum is 40.

The spelling of 211274157217 in words is "two hundred eleven billion, two hundred seventy-four million, one hundred fifty-seven thousand, two hundred seventeen".