21133220403 has 16 divisors (see below), whose sum is σ = 29090727936. Its totient is φ = 13636251360.

The previous prime is 21133220327. The next prime is 21133220411. The reversal of 21133220403 is 30402233112.

It is not a de Polignac number, because 21133220403 - 2²² = 21129026099 is a prime.

It is a super-2 number, since 2×21133220403² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21133220403.

It is not an unprimeable number, because it can be changed into a prime (21133220453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477201 + ... + 519602.

It is an arithmetic number, because the mean of its divisors is an integer number (1818170496).

Almost surely, 2^21133220403 is an apocalyptic number.

21133220403 is a deficient number, since it is larger than the sum of its proper divisors (7957507533).

21133220403 is a wasteful number, since it uses less digits than its factorization.

21133220403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997034.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21133220403 its reverse (30402233112), we get a palindrome (51535453515).

The spelling of 21133220403 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty thousand, four hundred three".