21768310849 has 8 divisors (see below), whose sum is σ = 23065762880. Its totient is φ = 20486034000.

The previous prime is 21768310819. The next prime is 21768310853. The reversal of 21768310849 is 94801386712.

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 21768310849 - 2¹³ = 21768302657 is a prime.

It is a super-2 number, since 2×21768310849² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21768310819) by changing a digit.

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, 3790842 + ... + 3796579.

It is an arithmetic number, because the mean of its divisors is an integer number (2883220360).

Almost surely, 2^21768310849 is an apocalyptic number.

It is an amenable number.

21768310849 is a deficient number, since it is larger than the sum of its proper divisors (1297452031).

21768310849 is a wasteful number, since it uses less digits than its factorization.

21768310849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7587591.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 21768310849 in words is "twenty-one billion, seven hundred sixty-eight million, three hundred ten thousand, eight hundred forty-nine".