420320521 has 8 divisors (see below), whose sum is σ = 425631744. Its totient is φ = 415042080.

The previous prime is 420320473. The next prime is 420320531. The reversal of 420320521 is 125023024.

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

It is a cyclic number.

It is not a de Polignac number, because 420320521 - 2¹³ = 420312329 is a prime.

It is a super-2 number, since 2×420320521² = 353338680747422882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420320531) 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, 18136 + ... + 34198.

It is an arithmetic number, because the mean of its divisors is an integer number (53203968).

Almost surely, 2^420320521 is an apocalyptic number.

It is an amenable number.

420320521 is a deficient number, since it is larger than the sum of its proper divisors (5311223).

420320521 is a wasteful number, since it uses less digits than its factorization.

420320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16391.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 420320521 is about 20501.7199522382. The cubic root of 420320521 is about 749.0776935252.

Adding to 420320521 its reverse (125023024), we get a palindrome (545343545).

The spelling of 420320521 in words is "four hundred twenty million, three hundred twenty thousand, five hundred twenty-one".