420521253 has 4 divisors (see below), whose sum is σ = 560695008. Its totient is φ = 280347500.

The previous prime is 420521221. The next prime is 420521263. The reversal of 420521253 is 352125024.

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 420521253 - 2⁵ = 420521221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420521263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70086873 + ... + 70086878.

It is an arithmetic number, because the mean of its divisors is an integer number (140173752).

Almost surely, 2^420521253 is an apocalyptic number.

It is an amenable number.

420521253 is a deficient number, since it is larger than the sum of its proper divisors (140173755).

420521253 is a wasteful number, since it uses less digits than its factorization.

420521253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140173754.

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

The square root of 420521253 is about 20506.6148596008. The cubic root of 420521253 is about 749.1969199457.

Adding to 420521253 its reverse (352125024), we get a palindrome (772646277).

The spelling of 420521253 in words is "four hundred twenty million, five hundred twenty-one thousand, two hundred fifty-three".