21534204044 has 6 divisors (see below), whose sum is σ = 37684857084. Its totient is φ = 10767102020.

The previous prime is 21534203993. The next prime is 21534204053. The reversal of 21534204044 is 44040243512.

It is a junction number, because it is equal to n+sod(n) for n = 21534203998 and 21534204016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691775502 + ... + 2691775509.

It is an arithmetic number, because the mean of its divisors is an integer number (6280809514).

Almost surely, 2^21534204044 is an apocalyptic number.

It is an amenable number.

21534204044 is a deficient number, since it is larger than the sum of its proper divisors (16150653040).

21534204044 is a wasteful number, since it uses less digits than its factorization.

21534204044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383551015 (or 5383551013 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 21534204044 its reverse (44040243512), we get a palindrome (65574447556).

The spelling of 21534204044 in words is "twenty-one billion, five hundred thirty-four million, two hundred four thousand, forty-four".