21213544132052 has 24 divisors (see below), whose sum is σ = 38133175954440. Its totient is φ = 10318443189120.

The previous prime is 21213544132051. The next prime is 21213544132093. The reversal of 21213544132052 is 25023144531212.

It can be written as a sum of positive squares in 4 ways, for example, as 5389807987216 + 15823736144836 = 2321596^2 + 3977906^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213544132051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10599527 + ... + 12440942.

It is an arithmetic number, because the mean of its divisors is an integer number (1588882331435).

Almost surely, 2^{21213544132052} is an apocalyptic number.

It is an amenable number.

21213544132052 is a deficient number, since it is larger than the sum of its proper divisors (16919631822388).

21213544132052 is a wasteful number, since it uses less digits than its factorization.

21213544132052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23046731 (or 23046729 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21213544132052 its reverse (25023144531212), we get a palindrome (46236688663264).

The spelling of 21213544132052 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-four million, one hundred thirty-two thousand, fifty-two".