21303531045 has 48 divisors (see below), whose sum is σ = 39114232560. Its totient is φ = 10689165312.

The previous prime is 21303531019. The next prime is 21303531083. The reversal of 21303531045 is 54013530312.

21303531045 is a `hidden beast` number, since 2 + 1 + 303 + 5 + 310 + 45 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 2436310881 + 18867220164 = 49359^2 + 137358^2 .

It is not a de Polignac number, because 21303531045 - 2¹² = 21303526949 is a prime.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 2717191 + ... + 2725019.

It is an arithmetic number, because the mean of its divisors is an integer number (814879845).

Almost surely, 2^21303531045 is an apocalyptic number.

It is an amenable number.

21303531045 is a deficient number, since it is larger than the sum of its proper divisors (17810701515).

21303531045 is a wasteful number, since it uses less digits than its factorization.

21303531045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11414 (or 11411 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The spelling of 21303531045 in words is "twenty-one billion, three hundred three million, five hundred thirty-one thousand, forty-five".