21443233504522 has 4 divisors (see below), whose sum is σ = 32164850256786. Its totient is φ = 10721616752260.

The previous prime is 21443233504447. The next prime is 21443233504541. The reversal of 21443233504522 is 22540533234412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21442632323161 + 601181361 = 4630619^2 + 24519^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360808376129 + ... + 5360808376132.

Almost surely, 2^{21443233504522} is an apocalyptic number.

21443233504522 is a deficient number, since it is larger than the sum of its proper divisors (10721616752264).

21443233504522 is a wasteful number, since it uses less digits than its factorization.

21443233504522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10721616752263.

The product of its (nonzero) digits is 691200, while the sum is 40.

Adding to 21443233504522 its reverse (22540533234412), we get a palindrome (43983766738934).

The spelling of 21443233504522 in words is "twenty-one trillion, four hundred forty-three billion, two hundred thirty-three million, five hundred four thousand, five hundred twenty-two".