21333132021 has 16 divisors (see below), whose sum is σ = 28793157120. Its totient is φ = 14047672560.

The previous prime is 21333132011. The next prime is 21333132049. The reversal of 21333132021 is 12023133312.

It is not a de Polignac number, because 21333132021 - 2⁷ = 21333131893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333132011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2001376 + ... + 2012006.

It is an arithmetic number, because the mean of its divisors is an integer number (1799572320).

Almost surely, 2^21333132021 is an apocalyptic number.

It is an amenable number.

21333132021 is a deficient number, since it is larger than the sum of its proper divisors (7460025099).

21333132021 is a wasteful number, since it uses less digits than its factorization.

21333132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18776.

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

Adding to 21333132021 its reverse (12023133312), we get a palindrome (33356265333).

The spelling of 21333132021 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty-two thousand, twenty-one".