21503445448 has 32 divisors (see below), whose sum is σ = 41321347200. Its totient is φ = 10487700288.

The previous prime is 21503445433. The next prime is 21503445517. The reversal of 21503445448 is 84454430512.

It is a happy number.

It is a super-2 number, since 2×21503445448² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21503445448.

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 in 7 ways as a sum of consecutive naturals, for example, 152511 + ... + 257422.

It is an arithmetic number, because the mean of its divisors is an integer number (1291292100).

Almost surely, 2^21503445448 is an apocalyptic number.

It is an amenable number.

21503445448 is a deficient number, since it is larger than the sum of its proper divisors (19817901752).

21503445448 is a wasteful number, since it uses less digits than its factorization.

21503445448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410101 (or 410097 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 40.

The spelling of 21503445448 in words is "twenty-one billion, five hundred three million, four hundred forty-five thousand, four hundred forty-eight".