1298118921 has 16 divisors (see below), whose sum is σ = 1910926080. Its totient is φ = 777258320.

The previous prime is 1298118881. The next prime is 1298118947.

It is a happy number.

1298118921 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1298118921 is a prime.

It is a super-2 number, since 2×1298118921² = 3370225466116408482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1298118121) 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 15 ways as a sum of consecutive naturals, for example, 234231 + ... + 239708.

It is an arithmetic number, because the mean of its divisors is an integer number (119432880).

Almost surely, 2^1298118921 is an apocalyptic number.

1298118921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1298118921 is a deficient number, since it is larger than the sum of its proper divisors (612807159).

1298118921 is a wasteful number, since it uses less digits than its factorization.

1298118921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474036.

The product of its digits is 20736, while the sum is 42.

The square root of 1298118921 is about 36029.4174390872. The cubic root of 1298118921 is about 1090.8662196644.

The spelling of 1298118921 in words is "one billion, two hundred ninety-eight million, one hundred eighteen thousand, nine hundred twenty-one".