21259166710 has 16 divisors (see below), whose sum is σ = 38425286592. Its totient is φ = 8468380800.

The previous prime is 21259166641. The next prime is 21259166711. The reversal of 21259166710 is 1766195212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21259166711) 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 7 ways as a sum of consecutive naturals, for example, 4408206 + ... + 4413025.

It is an arithmetic number, because the mean of its divisors is an integer number (2401580412).

Almost surely, 2^21259166710 is an apocalyptic number.

21259166710 is a deficient number, since it is larger than the sum of its proper divisors (17166119882).

21259166710 is a wasteful number, since it uses less digits than its factorization.

21259166710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821479.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 21259166710 in words is "twenty-one billion, two hundred fifty-nine million, one hundred sixty-six thousand, seven hundred ten".