21355456440166 has 8 divisors (see below), whose sum is σ = 32043554751960. Its totient is φ = 10674271522848.

The previous prime is 21355456440107. The next prime is 21355456440173. The reversal of 21355456440166 is 66104465455312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1728340896 + ... + 1728353251.

It is an arithmetic number, because the mean of its divisors is an integer number (4005444343995).

Almost surely, 2^{21355456440166} is an apocalyptic number.

21355456440166 is a deficient number, since it is larger than the sum of its proper divisors (10688098311794).

21355456440166 is a wasteful number, since it uses less digits than its factorization.

21355456440166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3456697238.

The product of its (nonzero) digits is 10368000, while the sum is 52.

The spelling of 21355456440166 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fifty-six million, four hundred forty thousand, one hundred sixty-six".