21542432450452 has 12 divisors (see below), whose sum is σ = 37804268648160. Its totient is φ = 10741212836696.

The previous prime is 21542432450411. The next prime is 21542432450521. The reversal of 21542432450452 is 25405423424512.

It is a super-2 number, since 2×21542432450452² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21542432450399 and 21542432450408.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7500845518 + ... + 7500848389.

It is an arithmetic number, because the mean of its divisors is an integer number (3150355720680).

Almost surely, 2^{21542432450452} is an apocalyptic number.

It is an amenable number.

21542432450452 is a deficient number, since it is larger than the sum of its proper divisors (16261836197708).

21542432450452 is a wasteful number, since it uses less digits than its factorization.

21542432450452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15001694270 (or 15001694268 counting only the distinct ones).

The product of its (nonzero) digits is 1536000, while the sum is 43.

Adding to 21542432450452 its reverse (25405423424512), we get a palindrome (46947855874964).

The spelling of 21542432450452 in words is "twenty-one trillion, five hundred forty-two billion, four hundred thirty-two million, four hundred fifty thousand, four hundred fifty-two".