21033133403 has 8 divisors (see below), whose sum is σ = 22029213600. Its totient is φ = 20043852928.

The previous prime is 21033133393. The next prime is 21033133421. The reversal of 21033133403 is 30433133012.

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 21033133403 - 2¹⁴ = 21033117019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033133423) 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, 1693598 + ... + 1705971.

It is an arithmetic number, because the mean of its divisors is an integer number (2753651700).

Almost surely, 2^21033133403 is an apocalyptic number.

21033133403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21033133403 is a deficient number, since it is larger than the sum of its proper divisors (996080197).

21033133403 is a wasteful number, since it uses less digits than its factorization.

21033133403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3399861.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21033133403 its reverse (30433133012), we get a palindrome (51466266415).

The spelling of 21033133403 in words is "twenty-one billion, thirty-three million, one hundred thirty-three thousand, four hundred three".