21033132321 has 8 divisors (see below), whose sum is σ = 28044900000. Its totient is φ = 14021726432.

The previous prime is 21033132311. The next prime is 21033132347. The reversal of 21033132321 is 12323133012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21033132321 - 2⁷ = 21033132193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033132311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106426 + ... + 231068.

It is an arithmetic number, because the mean of its divisors is an integer number (3505612500).

Almost surely, 2^21033132321 is an apocalyptic number.

It is an amenable number.

21033132321 is a deficient number, since it is larger than the sum of its proper divisors (7011767679).

21033132321 is a wasteful number, since it uses less digits than its factorization.

21033132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180895.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21033132321 its reverse (12323133012), we get a palindrome (33356265333).

The spelling of 21033132321 in words is "twenty-one billion, thirty-three million, one hundred thirty-two thousand, three hundred twenty-one".