1221175171602 has 24 divisors (see below), whose sum is σ = 2652973063884. Its totient is φ = 405967078944.

The previous prime is 1221175171561. The next prime is 1221175171609. The reversal of 1221175171602 is 2061715711221.

It is a happy number.

1221175171602 is a `hidden beast` number, since 1 + 2 + 21 + 17 + 5 + 17 + 1 + 602 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1162043036361 + 59132135241 = 1077981^2 + 243171^2 .

It is not an unprimeable number, because it can be changed into a prime (1221175171609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90935733 + ... + 90949160.

Almost surely, 2^{1221175171602} is an apocalyptic number.

1221175171602 is an abundant number, since it is smaller than the sum of its proper divisors (1431797892282).

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

1221175171602 is a wasteful number, since it uses less digits than its factorization.

1221175171602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181885274 (or 181885271 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 36.

The spelling of 1221175171602 in words is "one trillion, two hundred twenty-one billion, one hundred seventy-five million, one hundred seventy-one thousand, six hundred two".