521494421 has 8 divisors (see below), whose sum is σ = 597192000. Its totient is φ = 446096448.

The previous prime is 521494409. The next prime is 521494439. The reversal of 521494421 is 124494125.

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

It is not a de Polignac number, because 521494421 - 2¹⁰ = 521493397 is a prime.

It is a super-2 number, since 2×521494421² = 543912862268250482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521494321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71156 + ... + 78141.

It is an arithmetic number, because the mean of its divisors is an integer number (74649000).

Almost surely, 2^521494421 is an apocalyptic number.

It is an amenable number.

521494421 is a deficient number, since it is larger than the sum of its proper divisors (75697579).

521494421 is a wasteful number, since it uses less digits than its factorization.

521494421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149803.

The product of its digits is 11520, while the sum is 32.

The square root of 521494421 is about 22836.2523413979. The cubic root of 521494421 is about 804.9147555787.

The spelling of 521494421 in words is "five hundred twenty-one million, four hundred ninety-four thousand, four hundred twenty-one".