211121507017 has 4 divisors (see below), whose sum is σ = 212783881216. Its totient is φ = 209459132820.

The previous prime is 211121506969. The next prime is 211121507021. The reversal of 211121507017 is 710705121112.

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 a de Polignac number, because none of the positive numbers 2^k-211121507017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121507117) 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, 831186909 + ... + 831187162.

It is an arithmetic number, because the mean of its divisors is an integer number (53195970304).

Almost surely, 2^211121507017 is an apocalyptic number.

It is an amenable number.

211121507017 is a deficient number, since it is larger than the sum of its proper divisors (1662374199).

211121507017 is a wasteful number, since it uses less digits than its factorization.

211121507017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662374198.

The product of its (nonzero) digits is 980, while the sum is 28.

Adding to 211121507017 its reverse (710705121112), we get a palindrome (921826628129).

The spelling of 211121507017 in words is "two hundred eleven billion, one hundred twenty-one million, five hundred seven thousand, seventeen".