21867725275761 has 4 divisors (see below), whose sum is σ = 29156967034352. Its totient is φ = 14578483517172.

The previous prime is 21867725275729. The next prime is 21867725275771. The reversal of 21867725275761 is 16757252776812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21867725275761 - 2⁵ = 21867725275729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21867725275692 and 21867725275701.

It is not an unprimeable number, because it can be changed into a prime (21867725275771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3644620879291 + ... + 3644620879296.

It is an arithmetic number, because the mean of its divisors is an integer number (7289241758588).

Almost surely, 2^{21867725275761} is an apocalyptic number.

It is an amenable number.

21867725275761 is a deficient number, since it is larger than the sum of its proper divisors (7289241758591).

21867725275761 is an equidigital number, since it uses as much as digits as its factorization.

21867725275761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7289241758590.

The product of its digits is 138297600, while the sum is 66.

The spelling of 21867725275761 in words is "twenty-one trillion, eight hundred sixty-seven billion, seven hundred twenty-five million, two hundred seventy-five thousand, seven hundred sixty-one".