21364166157206 has 32 divisors (see below), whose sum is σ = 32236108185600. Its totient is φ = 10619031186720.

The previous prime is 21364166157157. The next prime is 21364166157241. The reversal of 21364166157206 is 60275166146312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333215480 + ... + 333279588.

It is an arithmetic number, because the mean of its divisors is an integer number (1007378380800).

Almost surely, 2^{21364166157206} is an apocalyptic number.

21364166157206 is a deficient number, since it is larger than the sum of its proper divisors (10871942028394).

21364166157206 is a wasteful number, since it uses less digits than its factorization.

21364166157206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65924.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 21364166157206 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred sixty-six million, one hundred fifty-seven thousand, two hundred six".