1221175171642 has 8 divisors (see below), whose sum is σ = 1939513507956. Its totient is φ = 574670668992.

The previous prime is 1221175171639. The next prime is 1221175171651. The reversal of 1221175171642 is 2461715711221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1219812011401 + 1363160241 = 1104451^2 + 36921^2 .

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 = 1221175171595 and 1221175171604.

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, 17958458373 + ... + 17958458440.

Almost surely, 2^{1221175171642} is an apocalyptic number.

1221175171642 is a deficient number, since it is larger than the sum of its proper divisors (718338336314).

1221175171642 is a wasteful number, since it uses less digits than its factorization.

1221175171642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35916916832.

The product of its digits is 47040, while the sum is 40.

The spelling of 1221175171642 in words is "one trillion, two hundred twenty-one billion, one hundred seventy-five million, one hundred seventy-one thousand, six hundred forty-two".