21774701877751 has 2 divisors, whose sum is σ = 21774701877752. Its totient is φ = 21774701877750.

The previous prime is 21774701877743. The next prime is 21774701877827. The reversal of 21774701877751 is 15777810747712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21774701877751 - 2³ = 21774701877743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21774701847751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10887350938875 + 10887350938876.

It is an arithmetic number, because the mean of its divisors is an integer number (10887350938876).

Almost surely, 2^{21774701877751} is an apocalyptic number.

21774701877751 is a deficient number, since it is larger than the sum of its proper divisors (1).

21774701877751 is an equidigital number, since it uses as much as digits as its factorization.

21774701877751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37647680, while the sum is 64.

The spelling of 21774701877751 in words is "twenty-one trillion, seven hundred seventy-four billion, seven hundred one million, eight hundred seventy-seven thousand, seven hundred fifty-one".