21201353144 has 16 divisors (see below), whose sum is σ = 39755734200. Its totient is φ = 10599824032.

The previous prime is 21201353083. The next prime is 21201353153. The reversal of 21201353144 is 44135310212.

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, 6134 + ... + 206010.

Almost surely, 2^21201353144 is an apocalyptic number.

It is an amenable number.

21201353144 is a deficient number, since it is larger than the sum of its proper divisors (18554381056).

21201353144 is a wasteful number, since it uses less digits than its factorization.

21201353144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213142 (or 213138 counting only the distinct ones).

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

Adding to 21201353144 its reverse (44135310212), we get a palindrome (65336663356).

The spelling of 21201353144 in words is "twenty-one billion, two hundred one million, three hundred fifty-three thousand, one hundred forty-four".