1011043121 has 4 divisors (see below), whose sum is σ = 1102956144. Its totient is φ = 919130100.

The previous prime is 1011043109. The next prime is 1011043123. The reversal of 1011043121 is 1213401101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011043121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011043096 and 1011043105.

It is not an unprimeable number, because it can be changed into a prime (1011043123) 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, 45956495 + ... + 45956516.

It is an arithmetic number, because the mean of its divisors is an integer number (275739036).

Almost surely, 2^1011043121 is an apocalyptic number.

1011043121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011043121 is a deficient number, since it is larger than the sum of its proper divisors (91913023).

1011043121 is an equidigital number, since it uses as much as digits as its factorization.

1011043121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91913022.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1011043121 is about 31796.9042675541. The cubic root of 1011043121 is about 1003.6675727988.

Adding to 1011043121 its reverse (1213401101), we get a palindrome (2224444222).

The spelling of 1011043121 in words is "one billion, eleven million, forty-three thousand, one hundred twenty-one".