1172141021 has 4 divisors (see below), whose sum is σ = 1172209500. Its totient is φ = 1172072544.

The previous prime is 1172141011. The next prime is 1172141029. The reversal of 1172141021 is 1201412711.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1201412711 = 67 ⋅17931533.

It can be written as a sum of positive squares in 2 ways, for example, as 519338521 + 652802500 = 22789^2 + 25550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1172141021 is a prime.

It is a super-2 number, since 2×1172141021² = 2747829146221844882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1172140984 and 1172141002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172141029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16505 + ... + 51153.

It is an arithmetic number, because the mean of its divisors is an integer number (293052375).

Almost surely, 2^1172141021 is an apocalyptic number.

It is an amenable number.

1172141021 is a deficient number, since it is larger than the sum of its proper divisors (68479).

1172141021 is an equidigital number, since it uses as much as digits as its factorization.

1172141021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68478.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1172141021 is about 34236.5451089914. The cubic root of 1172141021 is about 1054.3706018762.

Adding to 1172141021 its reverse (1201412711), we get a palindrome (2373553732).

The spelling of 1172141021 in words is "one billion, one hundred seventy-two million, one hundred forty-one thousand, twenty-one".