21542432450450 has 48 divisors (see below), whose sum is σ = 42426454923720. Its totient is φ = 8109989944320.

The previous prime is 21542432450411. The next prime is 21542432450521. The reversal of 21542432450450 is 5405423424512.

It can be written as a sum of positive squares in 12 ways, for example, as 16841675107321 + 4700757343129 = 4103861^2 + 2168123^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21542432450398 and 21542432450407.

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 23 ways as a sum of consecutive naturals, for example, 123956216 + ... + 124129884.

Almost surely, 2^{21542432450450} is an apocalyptic number.

21542432450450 is a deficient number, since it is larger than the sum of its proper divisors (20884022473270).

21542432450450 is a wasteful number, since it uses less digits than its factorization.

21542432450450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319631 (or 319626 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 41.

Adding to 21542432450450 its reverse (5405423424512), we get a palindrome (26947855874962).

The spelling of 21542432450450 in words is "twenty-one trillion, five hundred forty-two billion, four hundred thirty-two million, four hundred fifty thousand, four hundred fifty".