21133555245 has 48 divisors (see below), whose sum is σ = 40201080192. Its totient is φ = 10185175680.

The previous prime is 21133555243. The next prime is 21133555249. The reversal of 21133555245 is 54255533112.

21133555245 is a `hidden beast` number, since 21 + 13 + 35 + 552 + 45 = 666.

It is not a de Polignac number, because 21133555245 - 2¹ = 21133555243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133555243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45162 + ... + 210491.

It is an arithmetic number, because the mean of its divisors is an integer number (837522504).

Almost surely, 2^21133555245 is an apocalyptic number.

It is an amenable number.

21133555245 is a deficient number, since it is larger than the sum of its proper divisors (19067524947).

21133555245 is a wasteful number, since it uses less digits than its factorization.

21133555245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255842 (or 255839 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The spelling of 21133555245 in words is "twenty-one billion, one hundred thirty-three million, five hundred fifty-five thousand, two hundred forty-five".