21304050206 has 16 divisors (see below), whose sum is σ = 33023213568. Its totient is φ = 10297068600.

The previous prime is 21304050203. The next prime is 21304050331. The reversal of 21304050206 is 60205040312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304050203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132110 + ... + 245073.

It is an arithmetic number, because the mean of its divisors is an integer number (2063950848).

Almost surely, 2^21304050206 is an apocalyptic number.

21304050206 is a deficient number, since it is larger than the sum of its proper divisors (11719163362).

21304050206 is a wasteful number, since it uses less digits than its factorization.

21304050206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378127.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21304050206 its reverse (60205040312), we get a palindrome (81509090518).

The spelling of 21304050206 in words is "twenty-one billion, three hundred four million, fifty thousand, two hundred six".