21153042032 has 40 divisors (see below), whose sum is σ = 41321938560. Its totient is φ = 10489590720.

The previous prime is 21153041957. The next prime is 21153042059. The reversal of 21153042032 is 23024035112.

It is a junction number, because it is equal to n+sod(n) for n = 21153041989 and 21153042007.

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, 1272269 + ... + 1288787.

It is an arithmetic number, because the mean of its divisors is an integer number (1033048464).

Almost surely, 2^21153042032 is an apocalyptic number.

It is an amenable number.

21153042032 is a deficient number, since it is larger than the sum of its proper divisors (20168896528).

21153042032 is a wasteful number, since it uses less digits than its factorization.

21153042032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17181 (or 17175 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21153042032 its reverse (23024035112), we get a palindrome (44177077144).

The spelling of 21153042032 in words is "twenty-one billion, one hundred fifty-three million, forty-two thousand, thirty-two".