21033404010553 has 4 divisors (see below), whose sum is σ = 22945531647888. Its totient is φ = 19121276373220.

The previous prime is 21033404010529. The next prime is 21033404010559. The reversal of 21033404010553 is 35501040433012.

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 a de Polignac number, because none of the positive numbers 2^k-21033404010553 is a prime.

It is a super-2 number, since 2×21033404010553² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033404010559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956063818651 + ... + 956063818672.

It is an arithmetic number, because the mean of its divisors is an integer number (5736382911972).

Almost surely, 2^{21033404010553} is an apocalyptic number.

It is an amenable number.

21033404010553 is a deficient number, since it is larger than the sum of its proper divisors (1912127637335).

21033404010553 is a wasteful number, since it uses less digits than its factorization.

21033404010553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912127637334.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21033404010553 its reverse (35501040433012), we get a palindrome (56534444443565).

The spelling of 21033404010553 in words is "twenty-one trillion, thirty-three billion, four hundred four million, ten thousand, five hundred fifty-three".