200421749 has 4 divisors (see below), whose sum is σ = 218641920. Its totient is φ = 182201580.

The previous prime is 200421731. The next prime is 200421757. The reversal of 200421749 is 947124002.

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 not a de Polignac number, because 200421749 - 2¹⁶ = 200356213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200421649) 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, 9110069 + ... + 9110090.

It is an arithmetic number, because the mean of its divisors is an integer number (54660480).

Almost surely, 2^200421749 is an apocalyptic number.

It is an amenable number.

200421749 is a deficient number, since it is larger than the sum of its proper divisors (18220171).

200421749 is a wasteful number, since it uses less digits than its factorization.

200421749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220170.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 200421749 is about 14157.0388499855. The cubic root of 200421749 is about 585.2143262210.

The spelling of 200421749 in words is "two hundred million, four hundred twenty-one thousand, seven hundred forty-nine".