21133203081 has 16 divisors (see below), whose sum is σ = 30142695744. Its totient is φ = 13123344384.

The previous prime is 21133203071. The next prime is 21133203083. The reversal of 21133203081 is 18030233112.

It is not a de Polignac number, because 21133203081 - 2¹⁵ = 21133170313 is a prime.

It is a super-2 number, since 2×21133203081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21133203083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2131015 + ... + 2140908.

It is an arithmetic number, because the mean of its divisors is an integer number (1883918484).

Almost surely, 2^21133203081 is an apocalyptic number.

It is an amenable number.

21133203081 is a deficient number, since it is larger than the sum of its proper divisors (9009492663).

21133203081 is a wasteful number, since it uses less digits than its factorization.

21133203081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272040.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21133203081 its reverse (18030233112), we get a palindrome (39163436193).

The spelling of 21133203081 in words is "twenty-one billion, one hundred thirty-three million, two hundred three thousand, eighty-one".