21148763569 has 8 divisors (see below), whose sum is σ = 21321245088. Its totient is φ = 20976544800.

The previous prime is 21148763563. The next prime is 21148763609. The reversal of 21148763569 is 96536784112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21148763569 - 2¹¹ = 21148761521 is a prime.

It is a super-2 number, since 2×21148763569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21148763563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97594 + ... + 227644.

It is an arithmetic number, because the mean of its divisors is an integer number (2665155636).

Almost surely, 2^21148763569 is an apocalyptic number.

It is an amenable number.

21148763569 is a deficient number, since it is larger than the sum of its proper divisors (172481519).

21148763569 is a wasteful number, since it uses less digits than its factorization.

21148763569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131375.

The product of its digits is 2177280, while the sum is 52.

The spelling of 21148763569 in words is "twenty-one billion, one hundred forty-eight million, seven hundred sixty-three thousand, five hundred sixty-nine".