21203133011 has 4 divisors (see below), whose sum is σ = 22319087400. Its totient is φ = 20087178624.

The previous prime is 21203133001. The next prime is 21203133047. The reversal of 21203133011 is 11033130212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21203133011 - 2³⁰ = 20129391187 is a prime.

It is a super-2 number, since 2×21203133011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203133001) 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 3 ways as a sum of consecutive naturals, for example, 557977166 + ... + 557977203.

It is an arithmetic number, because the mean of its divisors is an integer number (5579771850).

Almost surely, 2^21203133011 is an apocalyptic number.

21203133011 is a deficient number, since it is larger than the sum of its proper divisors (1115954389).

21203133011 is a wasteful number, since it uses less digits than its factorization.

21203133011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115954388.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21203133011 its reverse (11033130212), we get a palindrome (32236263223).

The spelling of 21203133011 in words is "twenty-one billion, two hundred three million, one hundred thirty-three thousand, eleven".