21203031133 has 8 divisors (see below), whose sum is σ = 22328940320. Its totient is φ = 20078118000.

The previous prime is 21203031107. The next prime is 21203031149. The reversal of 21203031133 is 33113030212.

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 21203031133 - 2⁹ = 21203030621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21203031133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203031173) 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, 205110 + ... + 290647.

It is an arithmetic number, because the mean of its divisors is an integer number (2791117540).

Almost surely, 2^21203031133 is an apocalyptic number.

It is an amenable number.

21203031133 is a deficient number, since it is larger than the sum of its proper divisors (1125909187).

21203031133 is a wasteful number, since it uses less digits than its factorization.

21203031133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498027.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21203031133 its reverse (33113030212), we get a palindrome (54316061345).

The spelling of 21203031133 in words is "twenty-one billion, two hundred three million, thirty-one thousand, one hundred thirty-three".