21333145045 has 16 divisors (see below), whose sum is σ = 27109721520. Its totient is φ = 16060186624.

The previous prime is 21333145003. The next prime is 21333145103. The reversal of 21333145045 is 54054133312.

It can be written as a sum of positive squares in 8 ways, for example, as 3117323889 + 18215821156 = 55833^2 + 134966^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333145045 - 2¹⁷ = 21333013973 is a prime.

It is a super-2 number, since 2×21333145045² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21333144998 and 21333145016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717189 + ... + 746341.

It is an arithmetic number, because the mean of its divisors is an integer number (1694357595).

Almost surely, 2^21333145045 is an apocalyptic number.

It is an amenable number.

21333145045 is a deficient number, since it is larger than the sum of its proper divisors (5776576475).

21333145045 is a wasteful number, since it uses less digits than its factorization.

21333145045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37784.

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

Adding to 21333145045 its reverse (54054133312), we get a palindrome (75387278357).

The spelling of 21333145045 in words is "twenty-one billion, three hundred thirty-three million, one hundred forty-five thousand, forty-five".