1100002121 has 4 divisors (see below), whose sum is σ = 1120756932. Its totient is φ = 1079247312.

The previous prime is 1100002097. The next prime is 1100002129. The reversal of 1100002121 is 1212000011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 312582400 + 787419721 = 17680^2 + 28061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100002121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100002099 and 1100002108.

It is not an unprimeable number, because it can be changed into a prime (1100002129) 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, 10377326 + ... + 10377431.

It is an arithmetic number, because the mean of its divisors is an integer number (280189233).

Almost surely, 2^1100002121 is an apocalyptic number.

It is an amenable number.

1100002121 is a deficient number, since it is larger than the sum of its proper divisors (20754811).

1100002121 is an equidigital number, since it uses as much as digits as its factorization.

1100002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20754810.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1100002121 is about 33166.2798788167. The cubic root of 1100002121 is about 1032.2807789305.

Adding to 1100002121 its reverse (1212000011), we get a palindrome (2312002132).

The spelling of 1100002121 in words is "one billion, one hundred million, two thousand, one hundred twenty-one".