521234121 has 4 divisors (see below), whose sum is σ = 694978832. Its totient is φ = 347489412.

The previous prime is 521234113. The next prime is 521234123. The reversal of 521234121 is 121432125.

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 not a de Polignac number, because 521234121 - 2³ = 521234113 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521234123) 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, 86872351 + ... + 86872356.

It is an arithmetic number, because the mean of its divisors is an integer number (173744708).

Almost surely, 2^521234121 is an apocalyptic number.

It is an amenable number.

521234121 is a deficient number, since it is larger than the sum of its proper divisors (173744711).

521234121 is a wasteful number, since it uses less digits than its factorization.

521234121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173744710.

The product of its digits is 480, while the sum is 21.

The square root of 521234121 is about 22830.5523586268. The cubic root of 521234121 is about 804.7808109176.

Adding to 521234121 its reverse (121432125), we get a palindrome (642666246).

The spelling of 521234121 in words is "five hundred twenty-one million, two hundred thirty-four thousand, one hundred twenty-one".