21131103133 has 32 divisors (see below), whose sum is σ = 25166536704. Its totient is φ = 17368445952.

The previous prime is 21131103121. The next prime is 21131103179. The reversal of 21131103133 is 33130113112.

It is a cyclic number.

It is not a de Polignac number, because 21131103133 - 2⁹ = 21131102621 is a prime.

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 21131103133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131103193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4251816 + ... + 4256782.

It is an arithmetic number, because the mean of its divisors is an integer number (786454272).

Almost surely, 2^21131103133 is an apocalyptic number.

It is an amenable number.

21131103133 is a deficient number, since it is larger than the sum of its proper divisors (4035433571).

21131103133 is a wasteful number, since it uses less digits than its factorization.

21131103133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21131103133 its reverse (33130113112), we get a palindrome (54261216245).

The spelling of 21131103133 in words is "twenty-one billion, one hundred thirty-one million, one hundred three thousand, one hundred thirty-three".