200420521 has 4 divisors (see below), whose sum is σ = 229052032. Its totient is φ = 171789012.

The previous prime is 200420513. The next prime is 200420533. The reversal of 200420521 is 125024002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125024002 = 2 ⋅62512001.

It is a cyclic number.

It is not a de Polignac number, because 200420521 - 2³ = 200420513 is a prime.

It is a super-2 number, since 2×200420521² = 80336770475822882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200420495 and 200420504.

It is not an unprimeable number, because it can be changed into a prime (200420221) 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, 14315745 + ... + 14315758.

It is an arithmetic number, because the mean of its divisors is an integer number (57263008).

Almost surely, 2^200420521 is an apocalyptic number.

It is an amenable number.

200420521 is a deficient number, since it is larger than the sum of its proper divisors (28631511).

200420521 is an equidigital number, since it uses as much as digits as its factorization.

200420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28631510.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 200420521 is about 14156.9954792675. The cubic root of 200420521 is about 585.2131310003.

Adding to 200420521 its reverse (125024002), we get a palindrome (325444523).

The spelling of 200420521 in words is "two hundred million, four hundred twenty thousand, five hundred twenty-one".