521216426 has 8 divisors (see below), whose sum is σ = 781950240. Its totient is φ = 260566348.

The previous prime is 521216411. The next prime is 521216441. The reversal of 521216426 is 624612125.

521216426 = 6585² + 6586² + ... + 6596².

It is an interprime number because it is at equal distance from previous prime (521216411) and next prime (521216441).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1916 + ... + 32343.

It is an arithmetic number, because the mean of its divisors is an integer number (97743780).

Almost surely, 2^521216426 is an apocalyptic number.

521216426 is a deficient number, since it is larger than the sum of its proper divisors (260733814).

521216426 is a wasteful number, since it uses less digits than its factorization.

521216426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41868.

The product of its digits is 5760, while the sum is 29.

The square root of 521216426 is about 22830.1648263870. The cubic root of 521216426 is about 804.7717038407.

The spelling of 521216426 in words is "five hundred twenty-one million, two hundred sixteen thousand, four hundred twenty-six".