421520523 has 8 divisors (see below), whose sum is σ = 562334928. Its totient is φ = 280859904.

The previous prime is 421520521. The next prime is 421520527. The reversal of 421520523 is 325025124.

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

It is not a de Polignac number, because 421520523 - 2¹ = 421520521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421520493 and 421520502.

It is not an unprimeable number, because it can be changed into a prime (421520521) 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, 31890 + ... + 43127.

It is an arithmetic number, because the mean of its divisors is an integer number (70291866).

Almost surely, 2^421520523 is an apocalyptic number.

421520523 is a deficient number, since it is larger than the sum of its proper divisors (140814405).

421520523 is a wasteful number, since it uses less digits than its factorization.

421520523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76893.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 421520523 is about 20530.9649797568. The cubic root of 421520523 is about 749.7898806942.

Adding to 421520523 its reverse (325025124), we get a palindrome (746545647).

The spelling of 421520523 in words is "four hundred twenty-one million, five hundred twenty thousand, five hundred twenty-three".