2166221655242 has 8 divisors (see below), whose sum is σ = 3263903481216.
Its totient is φ = 1078253828172.
The previous prime is 2166221655211. The next prime is 2166221655337. The reversal of 2166221655242 is 2425561226612.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a junction number, because it is equal to n+sod(n) for n = 2166221655193 and 2166221655202.
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, 2428499168 + ... + 2428500059.
It is an arithmetic number, because the mean of its divisors is an integer number (407987935152).
Almost surely, 22166221655242 is an apocalyptic number.
2166221655242 is a deficient number, since it is larger than the sum of its proper divisors (1097681825974).
2166221655242 is a wasteful number, since it uses less digits than its factorization.
2166221655242 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4856999452.
The product of its digits is 691200, while the sum is 44.
The spelling of 2166221655242 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-five thousand, two hundred forty-two".