21526723168761 has 32 divisors (see below), whose sum is σ = 29139374315520. Its totient is φ = 14133750977600.

The previous prime is 21526723168739. The next prime is 21526723168771. The reversal of 21526723168761 is 16786132762512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21526723168761 - 2³⁵ = 21492363430393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21526723168721) 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 31 ways as a sum of consecutive naturals, for example, 131813446 + ... + 131976656.

It is an arithmetic number, because the mean of its divisors is an integer number (910605447360).

Almost surely, 2^{21526723168761} is an apocalyptic number.

It is an amenable number.

21526723168761 is a deficient number, since it is larger than the sum of its proper divisors (7612651146759).

21526723168761 is a wasteful number, since it uses less digits than its factorization.

21526723168761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164957.

The product of its digits is 10160640, while the sum is 57.

The spelling of 21526723168761 in words is "twenty-one trillion, five hundred twenty-six billion, seven hundred twenty-three million, one hundred sixty-eight thousand, seven hundred sixty-one".