21426646751761 has 8 divisors (see below), whose sum is σ = 21462705467840. Its totient is φ = 21390606130608.

The previous prime is 21426646751743. The next prime is 21426646751813. The reversal of 21426646751761 is 16715764662412.

It is a happy number.

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 21426646751761 - 2²⁵ = 21426613197329 is a prime.

It is a super-2 number, since 2×21426646751761² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21426646751696 and 21426646751705.

It is not an unprimeable number, because it can be changed into a prime (21426646751261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2152446 + ... + 6891031.

It is an arithmetic number, because the mean of its divisors is an integer number (2682838183480).

Almost surely, 2^{21426646751761} is an apocalyptic number.

It is an amenable number.

21426646751761 is a deficient number, since it is larger than the sum of its proper divisors (36058716079).

21426646751761 is an equidigital number, since it uses as much as digits as its factorization.

21426646751761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9047463.

The product of its digits is 20321280, while the sum is 58.

The spelling of 21426646751761 in words is "twenty-one trillion, four hundred twenty-six billion, six hundred forty-six million, seven hundred fifty-one thousand, seven hundred sixty-one".