1021205115166 has 16 divisors (see below), whose sum is σ = 1557996968880. Its totient is φ = 501875308480.

The previous prime is 1021205115149. The next prime is 1021205115167. The reversal of 1021205115166 is 6615115021201.

1021205115166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021205115167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190626 + ... + 1441786.

It is an arithmetic number, because the mean of its divisors is an integer number (97374810555).

Almost surely, 2^{1021205115166} is an apocalyptic number.

1021205115166 is a deficient number, since it is larger than the sum of its proper divisors (536791853714).

1021205115166 is a wasteful number, since it uses less digits than its factorization.

1021205115166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258139.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 1021205115166 in words is "one trillion, twenty-one billion, two hundred five million, one hundred fifteen thousand, one hundred sixty-six".