21513453333 has 4 divisors (see below), whose sum is σ = 28684604448. Its totient is φ = 14342302220.

The previous prime is 21513453307. The next prime is 21513453349. The reversal of 21513453333 is 33335431512.

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-21513453333 is a prime.

It is a super-2 number, since 2×21513453333² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21513453294 and 21513453303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513453383) 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, 3585575553 + ... + 3585575558.

It is an arithmetic number, because the mean of its divisors is an integer number (7171151112).

Almost surely, 2^21513453333 is an apocalyptic number.

It is an amenable number.

21513453333 is a deficient number, since it is larger than the sum of its proper divisors (7171151115).

21513453333 is an equidigital number, since it uses as much as digits as its factorization.

21513453333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7171151114.

The product of its digits is 48600, while the sum is 33.

Adding to 21513453333 its reverse (33335431512), we get a palindrome (54848884845).

The spelling of 21513453333 in words is "twenty-one billion, five hundred thirteen million, four hundred fifty-three thousand, three hundred thirty-three".