21441212451533 has 6 divisors (see below), whose sum is σ = 24941818566126. Its totient is φ = 18378182101272.

The previous prime is 21441212451509. The next prime is 21441212451553. The reversal of 21441212451533 is 33515421214412.

It can be written as a sum of positive squares in only one way, i.e., 17232486347209 + 4208726104324 = 4151203^2 + 2051518^2 .

It is not a de Polignac number, because 21441212451533 - 2⁴⁰ = 20341700823757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441212451553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218787882110 + ... + 218787882207.

It is an arithmetic number, because the mean of its divisors is an integer number (4156969761021).

Almost surely, 2^{21441212451533} is an apocalyptic number.

It is an amenable number.

21441212451533 is a deficient number, since it is larger than the sum of its proper divisors (3500606114593).

21441212451533 is an equidigital number, since it uses as much as digits as its factorization.

21441212451533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437575764331 (or 437575764324 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

Adding to 21441212451533 its reverse (33515421214412), we get a palindrome (54956633665945).

The spelling of 21441212451533 in words is "twenty-one trillion, four hundred forty-one billion, two hundred twelve million, four hundred fifty-one thousand, five hundred thirty-three".