512121221 has 4 divisors (see below), whose sum is σ = 512172000. Its totient is φ = 512070444.

The previous prime is 512121217. The next prime is 512121251. The reversal of 512121221 is 122121215.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 512121221 - 2² = 512121217 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 512121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512121251) 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, 4571 + ... + 32328.

It is an arithmetic number, because the mean of its divisors is an integer number (128043000).

Almost surely, 2^512121221 is an apocalyptic number.

It is an amenable number.

512121221 is a deficient number, since it is larger than the sum of its proper divisors (50779).

512121221 is a wasteful number, since it uses less digits than its factorization.

512121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50778.

The product of its digits is 80, while the sum is 17.

The square root of 512121221 is about 22630.0954704128. The cubic root of 512121221 is about 800.0631309555.

Adding to 512121221 its reverse (122121215), we get a palindrome (634242436).

The spelling of 512121221 in words is "five hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".