21516032204 has 12 divisors (see below), whose sum is σ = 37695801528. Its totient is φ = 10745803200.

The previous prime is 21516032173. The next prime is 21516032227. The reversal of 21516032204 is 40223061512.

It is a happy number.

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, 3049262 + ... + 3056309.

It is an arithmetic number, because the mean of its divisors is an integer number (3141316794).

Almost surely, 2^21516032204 is an apocalyptic number.

It is an amenable number.

21516032204 is a deficient number, since it is larger than the sum of its proper divisors (16179769324).

21516032204 is a wasteful number, since it uses less digits than its factorization.

21516032204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106456 (or 6106454 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21516032204 its reverse (40223061512), we get a palindrome (61739093716).

The spelling of 21516032204 in words is "twenty-one billion, five hundred sixteen million, thirty-two thousand, two hundred four".