21023361133 has 4 divisors (see below), whose sum is σ = 21034971648. Its totient is φ = 21011750620.

The previous prime is 21023361131. The next prime is 21023361143. The reversal of 21023361133 is 33116332012.

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 21023361133 - 2¹ = 21023361131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023361098 and 21023361107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023361131) 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, 5802541 + ... + 5806162.

It is an arithmetic number, because the mean of its divisors is an integer number (5258742912).

Almost surely, 2^21023361133 is an apocalyptic number.

It is an amenable number.

21023361133 is a deficient number, since it is larger than the sum of its proper divisors (11610515).

21023361133 is a wasteful number, since it uses less digits than its factorization.

21023361133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610514.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21023361133 its reverse (33116332012), we get a palindrome (54139693145).

The spelling of 21023361133 in words is "twenty-one billion, twenty-three million, three hundred sixty-one thousand, one hundred thirty-three".