21767608242929 has 2 divisors, whose sum is σ = 21767608242930. Its totient is φ = 21767608242928.

The previous prime is 21767608242871. The next prime is 21767608242949. The reversal of 21767608242929 is 92924280676712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19029486798400 + 2738121444529 = 4362280^2 + 1654727^2 .

It is a cyclic number.

It is not a de Polignac number, because 21767608242929 - 2³² = 21763313275633 is a prime.

It is not a weakly prime, because it can be changed into another prime (21767608242949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10883804121464 + 10883804121465.

It is an arithmetic number, because the mean of its divisors is an integer number (10883804121465).

Almost surely, 2^{21767608242929} is an apocalyptic number.

It is an amenable number.

21767608242929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21767608242929 is an equidigital number, since it uses as much as digits as its factorization.

21767608242929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73156608, while the sum is 65.

The spelling of 21767608242929 in words is "twenty-one trillion, seven hundred sixty-seven billion, six hundred eight million, two hundred forty-two thousand, nine hundred twenty-nine".