420525221 has 4 divisors (see below), whose sum is σ = 420635712. Its totient is φ = 420414732.

The previous prime is 420525197. The next prime is 420525241. The reversal of 420525221 is 122525024.

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 a de Polignac number, because none of the positive numbers 2^k-420525221 is a prime.

It is a super-2 number, since 2×420525221² = 353682922994197682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420525241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49325 + ... + 57218.

It is an arithmetic number, because the mean of its divisors is an integer number (105158928).

Almost surely, 2^420525221 is an apocalyptic number.

It is an amenable number.

420525221 is a deficient number, since it is larger than the sum of its proper divisors (110491).

420525221 is a wasteful number, since it uses less digits than its factorization.

420525221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110490.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 420525221 is about 20506.7116086417. The cubic root of 420525221 is about 749.1992763895.

The spelling of 420525221 in words is "four hundred twenty million, five hundred twenty-five thousand, two hundred twenty-one".