21354140146166 has 4 divisors (see below), whose sum is σ = 32031210219252. Its totient is φ = 10677070073082.

The previous prime is 21354140146147. The next prime is 21354140146169. The reversal of 21354140146166 is 66164104145312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354140146169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338535036540 + ... + 5338535036543.

It is an arithmetic number, because the mean of its divisors is an integer number (8007802554813).

Almost surely, 2^{21354140146166} is an apocalyptic number.

21354140146166 is a deficient number, since it is larger than the sum of its proper divisors (10677070073086).

21354140146166 is a wasteful number, since it uses less digits than its factorization.

21354140146166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677070073085.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 21354140146166 in words is "twenty-one trillion, three hundred fifty-four billion, one hundred forty million, one hundred forty-six thousand, one hundred sixty-six".