1001011121 has 8 divisors (see below), whose sum is σ = 1092252384. Its totient is φ = 909809920.

The previous prime is 1001011117. The next prime is 1001011127. The reversal of 1001011121 is 1211101001.

It is a happy number.

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 1001011121 - 2² = 1001011117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001011099 and 1001011108.

It is not an unprimeable number, because it can be changed into a prime (1001011127) 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, 70226 + ... + 83268.

It is an arithmetic number, because the mean of its divisors is an integer number (136531548).

Almost surely, 2^1001011121 is an apocalyptic number.

1001011121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001011121 is a deficient number, since it is larger than the sum of its proper divisors (91241263).

1001011121 is a wasteful number, since it uses less digits than its factorization.

1001011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20031.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1001011121 is about 31638.7597892206. The cubic root of 1001011121 is about 1000.3369268009.

Adding to 1001011121 its reverse (1211101001), we get a palindrome (2212112122).

The spelling of 1001011121 in words is "one billion, one million, eleven thousand, one hundred twenty-one".