21872981769 has 8 divisors (see below), whose sum is σ = 29167181472. Its totient is φ = 14580384960.

The previous prime is 21872981747. The next prime is 21872981839. The reversal of 21872981769 is 96718927812.

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

It is not a de Polignac number, because 21872981769 - 2⁸ = 21872981513 is a prime.

It is a super-2 number, since 2×21872981769² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21872981369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368512 + ... + 423729.

It is an arithmetic number, because the mean of its divisors is an integer number (3645897684).

Almost surely, 2^21872981769 is an apocalyptic number.

It is an amenable number.

21872981769 is a deficient number, since it is larger than the sum of its proper divisors (7294199703).

21872981769 is an equidigital number, since it uses as much as digits as its factorization.

21872981769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801447.

The product of its digits is 6096384, while the sum is 60.

The spelling of 21872981769 in words is "twenty-one billion, eight hundred seventy-two million, nine hundred eighty-one thousand, seven hundred sixty-nine".