1100321981 has 8 divisors (see below), whose sum is σ = 1211570784. Its totient is φ = 990943120.

The previous prime is 1100321951. The next prime is 1100321983. The reversal of 1100321981 is 1891230011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1100321981 - 2¹⁸ = 1100059837 is a prime.

It is a super-2 number, since 2×1100321981² = 2421416923743528722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1100321981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100321983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466250 + ... + 468603.

It is an arithmetic number, because the mean of its divisors is an integer number (151446348).

Almost surely, 2^1100321981 is an apocalyptic number.

1100321981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100321981 is a deficient number, since it is larger than the sum of its proper divisors (111248803).

1100321981 is a wasteful number, since it uses less digits than its factorization.

1100321981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934971.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1100321981 is about 33171.1015946109. The cubic root of 1100321981 is about 1032.3808252016.

Adding to 1100321981 its reverse (1891230011), we get a palindrome (2991551992).

The spelling of 1100321981 in words is "one billion, one hundred million, three hundred twenty-one thousand, nine hundred eighty-one".