11010121001 has 4 divisors (see below), whose sum is σ = 12011041104. Its totient is φ = 10009200900.

The previous prime is 11010120997. The next prime is 11010121019. The reversal of 11010121001 is 10012101011.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10012101011 = 11 ⋅910191001.

It is a cyclic number.

It is not a de Polignac number, because 11010121001 - 2² = 11010120997 is a prime.

It is a super-2 number, since 2×11010121001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11010121001.

It is not an unprimeable number, because it can be changed into a prime (11010121051) 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, 500460035 + ... + 500460056.

It is an arithmetic number, because the mean of its divisors is an integer number (3002760276).

Almost surely, 2^11010121001 is an apocalyptic number.

11010121001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11010121001 is a deficient number, since it is larger than the sum of its proper divisors (1000920103).

11010121001 is a wasteful number, since it uses less digits than its factorization.

11010121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000920102.

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

Adding to 11010121001 its reverse (10012101011), we get a palindrome (21022222012).

The spelling of 11010121001 in words is "eleven billion, ten million, one hundred twenty-one thousand, one".