521361001432421 has 4 divisors (see below), whose sum is σ = 521362201272192. Its totient is φ = 521359801592652.

The previous prime is 521361001432417. The next prime is 521361001432463. The reversal of 521361001432421 is 124234100163125.

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 a cyclic number.

It is not a de Polignac number, because 521361001432421 - 2² = 521361001432417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521361001432471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599267861 + ... + 600137226.

It is an arithmetic number, because the mean of its divisors is an integer number (130340550318048).

Almost surely, 2^{521361001432421} is an apocalyptic number.

It is an amenable number.

521361001432421 is a deficient number, since it is larger than the sum of its proper divisors (1199839771).

521361001432421 is a wasteful number, since it uses less digits than its factorization.

521361001432421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199839770.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 521361001432421 its reverse (124234100163125), we get a palindrome (645595101595546).

The spelling of 521361001432421 in words is "five hundred twenty-one trillion, three hundred sixty-one billion, one million, four hundred thirty-two thousand, four hundred twenty-one".