21133404443 has 8 divisors (see below), whose sum is σ = 21428013648. Its totient is φ = 20838933504.

The previous prime is 21133404431. The next prime is 21133404469. The reversal of 21133404443 is 34440433112.

It is a happy number.

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 21133404443 - 2¹⁸ = 21133142299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133404343) 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, 294971 + ... + 359547.

It is an arithmetic number, because the mean of its divisors is an integer number (2678501706).

Almost surely, 2^21133404443 is an apocalyptic number.

21133404443 is a deficient number, since it is larger than the sum of its proper divisors (294609205).

21133404443 is an equidigital number, since it uses as much as digits as its factorization.

21133404443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69133.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21133404443 its reverse (34440433112), we get a palindrome (55573837555).

The spelling of 21133404443 in words is "twenty-one billion, one hundred thirty-three million, four hundred four thousand, four hundred forty-three".