200630921 has 4 divisors (see below), whose sum is σ = 204899712. Its totient is φ = 196362132.

The previous prime is 200630879. The next prime is 200630929. The reversal of 200630921 is 129036002.

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: 129036002 = 2 ⋅64518001.

It is a cyclic number.

It is not a de Polignac number, because 200630921 - 2¹⁴ = 200614537 is a prime.

It is a super-2 number, since 2×200630921² = 80505532922616482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200630929) 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, 2134325 + ... + 2134418.

It is an arithmetic number, because the mean of its divisors is an integer number (51224928).

Almost surely, 2^200630921 is an apocalyptic number.

It is an amenable number.

200630921 is a deficient number, since it is larger than the sum of its proper divisors (4268791).

200630921 is an equidigital number, since it uses as much as digits as its factorization.

200630921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268790.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 200630921 is about 14164.4244853083. The cubic root of 200630921 is about 585.4178435395.

Adding to 200630921 its reverse (129036002), we get a palindrome (329666923).

The spelling of 200630921 in words is "two hundred million, six hundred thirty thousand, nine hundred twenty-one".