21202113133 has 4 divisors (see below), whose sum is σ = 21203972928. Its totient is φ = 21200253340.

The previous prime is 21202113131. The next prime is 21202113137. The reversal of 21202113133 is 33131120212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21202113133 - 2¹ = 21202113131 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 21202113133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202113131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912691 + ... + 935632.

It is an arithmetic number, because the mean of its divisors is an integer number (5300993232).

Almost surely, 2^21202113133 is an apocalyptic number.

It is an amenable number.

21202113133 is a deficient number, since it is larger than the sum of its proper divisors (1859795).

21202113133 is a wasteful number, since it uses less digits than its factorization.

21202113133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859794.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21202113133 its reverse (33131120212), we get a palindrome (54333233345).

The spelling of 21202113133 in words is "twenty-one billion, two hundred two million, one hundred thirteen thousand, one hundred thirty-three".