521211117 has 16 divisors (see below), whose sum is σ = 795180672. Its totient is φ = 297477120.

The previous prime is 521211107. The next prime is 521211137. The reversal of 521211117 is 711112125.

It is not a de Polignac number, because 521211117 - 2⁴ = 521211101 is a prime.

It is a super-3 number, since 3×521211117³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 521211093 and 521211102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521211107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3517 + ... + 32477.

It is an arithmetic number, because the mean of its divisors is an integer number (49698792).

Almost surely, 2^521211117 is an apocalyptic number.

It is an amenable number.

521211117 is a deficient number, since it is larger than the sum of its proper divisors (273969555).

521211117 is a wasteful number, since it uses less digits than its factorization.

521211117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29828.

The product of its digits is 140, while the sum is 21.

The square root of 521211117 is about 22830.0485544819. The cubic root of 521211117 is about 804.7689714201.

The spelling of 521211117 in words is "five hundred twenty-one million, two hundred eleven thousand, one hundred seventeen".