1173201021 has 12 divisors (see below), whose sum is σ = 1719917472. Its totient is φ = 770459976.

The previous prime is 1173201013. The next prime is 1173201067. The reversal of 1173201021 is 1201023711.

It is a happy number.

It is not a de Polignac number, because 1173201021 - 2³ = 1173201013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1173200985 and 1173201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1173202021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 972201 + ... + 973406.

It is an arithmetic number, because the mean of its divisors is an integer number (143326456).

Almost surely, 2^1173201021 is an apocalyptic number.

It is an amenable number.

1173201021 is a deficient number, since it is larger than the sum of its proper divisors (546716451).

1173201021 is a wasteful number, since it uses less digits than its factorization.

1173201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945680 (or 1945677 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1173201021 is about 34252.0221446851. The cubic root of 1173201021 is about 1054.6883384184.

Adding to 1173201021 its reverse (1201023711), we get a palindrome (2374224732).

It can be divided in two parts, 117320 and 1021, that added together give a triangular number (118341 = T₄₈₆).

The spelling of 1173201021 in words is "one billion, one hundred seventy-three million, two hundred one thousand, twenty-one".