21144021232 has 40 divisors (see below), whose sum is σ = 42032145584. Its totient is φ = 10298340864.

The previous prime is 21144021211. The next prime is 21144021247. The reversal of 21144021232 is 23212044112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215428 + ... + 297820.

Almost surely, 2^21144021232 is an apocalyptic number.

It is an amenable number.

21144021232 is a deficient number, since it is larger than the sum of its proper divisors (20888124352).

21144021232 is a wasteful number, since it uses less digits than its factorization.

21144021232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82817 (or 82811 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21144021232 its reverse (23212044112), we get a palindrome (44356065344).

The spelling of 21144021232 in words is "twenty-one billion, one hundred forty-four million, twenty-one thousand, two hundred thirty-two".