21132234441645 has 16 divisors (see below), whose sum is σ = 33863834125440. Its totient is φ = 11253105362624.

The previous prime is 21132234441629. The next prime is 21132234441649. The reversal of 21132234441645 is 54614443223112.

It is a cyclic number.

It is not a de Polignac number, because 21132234441645 - 2⁴ = 21132234441629 is a prime.

It is a super-3 number, since 3×21132234441645³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21132234441597 and 21132234441606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132234441649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1088719530 + ... + 1088738939.

It is an arithmetic number, because the mean of its divisors is an integer number (2116489632840).

Almost surely, 2^{21132234441645} is an apocalyptic number.

It is an amenable number.

21132234441645 is a deficient number, since it is larger than the sum of its proper divisors (12731599683795).

21132234441645 is a wasteful number, since it uses less digits than its factorization.

21132234441645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177459124.

The product of its digits is 552960, while the sum is 42.

Adding to 21132234441645 its reverse (54614443223112), we get a palindrome (75746677664757).

The spelling of 21132234441645 in words is "twenty-one trillion, one hundred thirty-two billion, two hundred thirty-four million, four hundred forty-one thousand, six hundred forty-five".