21244303216 has 20 divisors (see below), whose sum is σ = 41167389424. Its totient is φ = 10620460800.

The previous prime is 21244303189. The next prime is 21244303231. The reversal of 21244303216 is 61230344212.

It is a happy number.

It is a congruent 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, 1261 + ... + 206131.

Almost surely, 2^21244303216 is an apocalyptic number.

It is an amenable number.

21244303216 is a deficient number, since it is larger than the sum of its proper divisors (19923086208).

21244303216 is a wasteful number, since it uses less digits than its factorization.

21244303216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211360 (or 211354 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21244303216 its reverse (61230344212), we get a palindrome (82474647428).

The spelling of 21244303216 in words is "twenty-one billion, two hundred forty-four million, three hundred three thousand, two hundred sixteen".