209421004 has 24 divisors (see below), whose sum is σ = 395081120. Its totient is φ = 96557184.

The previous prime is 209420993. The next prime is 209421041. The reversal of 209421004 is 400124902.

209421004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82417 + ... + 84919.

Almost surely, 2^209421004 is an apocalyptic number.

It is an amenable number.

209421004 is a deficient number, since it is larger than the sum of its proper divisors (185660116).

209421004 is a wasteful number, since it uses less digits than its factorization.

209421004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129 (or 4127 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 209421004 is about 14471.3856972993. The cubic root of 209421004 is about 593.8454215024.

Adding to 209421004 its reverse (400124902), we get a palindrome (609545906).

The spelling of 209421004 in words is "two hundred nine million, four hundred twenty-one thousand, four".