1221166650700 has 36 divisors (see below), whose sum is σ = 2675659146160. Its totient is φ = 483724261440.

The previous prime is 1221166650643. The next prime is 1221166650731. The reversal of 1221166650700 is 70566611221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221166650700.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59269635 + ... + 59290234.

Almost surely, 2^{1221166650700} is an apocalyptic number.

1221166650700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221166650700 is an abundant number, since it is smaller than the sum of its proper divisors (1454492495460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221166650700 is a wasteful number, since it uses less digits than its factorization.

1221166650700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118559986 (or 118559979 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 1221166650700 in words is "one trillion, two hundred twenty-one billion, one hundred sixty-six million, six hundred fifty thousand, seven hundred".