21011569448 has 16 divisors (see below), whose sum is σ = 39398724000. Its totient is φ = 10505243056.

The previous prime is 21011569429. The next prime is 21011569451. The reversal of 21011569448 is 84496511012.

It is a super-3 number, since 3×21011569448³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131693 + ... + 243651.

It is an arithmetic number, because the mean of its divisors is an integer number (2462420250).

Almost surely, 2^21011569448 is an apocalyptic number.

It is an amenable number.

21011569448 is a deficient number, since it is larger than the sum of its proper divisors (18387154552).

21011569448 is a wasteful number, since it uses less digits than its factorization.

21011569448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135424 (or 135420 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 21011569448 in words is "twenty-one billion, eleven million, five hundred sixty-nine thousand, four hundred forty-eight".