21533154545 has 16 divisors (see below), whose sum is σ = 29807180928. Its totient is φ = 14627592960.

The previous prime is 21533154509. The next prime is 21533154547. The reversal of 21533154545 is 54545133512.

It is not a de Polignac number, because 21533154545 - 2²⁶ = 21466045681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21533154499 and 21533154508.

It is not an unprimeable number, because it can be changed into a prime (21533154547) 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 15 ways as a sum of consecutive naturals, for example, 2871176 + ... + 2878665.

It is an arithmetic number, because the mean of its divisors is an integer number (1862948808).

Almost surely, 2^21533154545 is an apocalyptic number.

It is an amenable number.

21533154545 is a deficient number, since it is larger than the sum of its proper divisors (8274026383).

21533154545 is a wasteful number, since it uses less digits than its factorization.

21533154545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749960.

The product of its digits is 180000, while the sum is 38.

The spelling of 21533154545 in words is "twenty-one billion, five hundred thirty-three million, one hundred fifty-four thousand, five hundred forty-five".