21203240204 has 12 divisors (see below), whose sum is σ = 37205151984. Its totient is φ = 10573196784.

The previous prime is 21203240197. The next prime is 21203240231. The reversal of 21203240204 is 40204230212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7104152 + ... + 7107135.

It is an arithmetic number, because the mean of its divisors is an integer number (3100429332).

Almost surely, 2^21203240204 is an apocalyptic number.

It is an amenable number.

21203240204 is a deficient number, since it is larger than the sum of its proper divisors (16001911780).

21203240204 is a wasteful number, since it uses less digits than its factorization.

21203240204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14211664 (or 14211662 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21203240204 its reverse (40204230212), we get a palindrome (61407470416).

The spelling of 21203240204 in words is "twenty-one billion, two hundred three million, two hundred forty thousand, two hundred four".