21229887544 has 16 divisors (see below), whose sum is σ = 39934037520. Its totient is φ = 10580810880.

The previous prime is 21229887541. The next prime is 21229887551. The reversal of 21229887544 is 44578892212.

It is a junction number, because it is equal to n+sod(n) for n = 21229887491 and 21229887500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21229887541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4263969 + ... + 4268944.

It is an arithmetic number, because the mean of its divisors is an integer number (2495877345).

Almost surely, 2^21229887544 is an apocalyptic number.

It is an amenable number.

21229887544 is a deficient number, since it is larger than the sum of its proper divisors (18704149976).

21229887544 is a wasteful number, since it uses less digits than its factorization.

21229887544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8533230 (or 8533226 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The spelling of 21229887544 in words is "twenty-one billion, two hundred twenty-nine million, eight hundred eighty-seven thousand, five hundred forty-four".