521642422 has 8 divisors (see below), whose sum is σ = 894244176. Its totient is φ = 223561032.

The previous prime is 521642419. The next prime is 521642431. The reversal of 521642422 is 224246125.

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

It is a super-2 number, since 2×521642422² = 544221632860052168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18630073 + ... + 18630100.

It is an arithmetic number, because the mean of its divisors is an integer number (111780522).

Almost surely, 2^521642422 is an apocalyptic number.

521642422 is a deficient number, since it is larger than the sum of its proper divisors (372601754).

521642422 is a wasteful number, since it uses less digits than its factorization.

521642422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37260182.

The product of its digits is 7680, while the sum is 28.

The square root of 521642422 is about 22839.4925950644. The cubic root of 521642422 is about 804.9908937668.

Adding to 521642422 its reverse (224246125), we get a palindrome (745888547).

The spelling of 521642422 in words is "five hundred twenty-one million, six hundred forty-two thousand, four hundred twenty-two".