21252333545 has 16 divisors (see below), whose sum is σ = 26192255232. Its totient is φ = 16545150720.

The previous prime is 21252333517. The next prime is 21252333547. The reversal of 21252333545 is 54533325212.

It is not a de Polignac number, because 21252333545 - 2⁶ = 21252333481 is a prime.

It is a super-2 number, since 2×21252333545² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21252333547) by changing a digit.

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, 124112 + ... + 240641.

It is an arithmetic number, because the mean of its divisors is an integer number (1637015952).

Almost surely, 2^21252333545 is an apocalyptic number.

It is an amenable number.

21252333545 is a deficient number, since it is larger than the sum of its proper divisors (4939921687).

21252333545 is a wasteful number, since it uses less digits than its factorization.

21252333545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365072.

The product of its digits is 108000, while the sum is 35.

Adding to 21252333545 its reverse (54533325212), we get a palindrome (75785658757).

The spelling of 21252333545 in words is "twenty-one billion, two hundred fifty-two million, three hundred thirty-three thousand, five hundred forty-five".