1100020121 has 4 divisors (see below), whose sum is σ = 1110700032. Its totient is φ = 1089340212.

The previous prime is 1100020099. The next prime is 1100020127. The reversal of 1100020121 is 1210200011.

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: 1210200011 = 30391 ⋅39821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100020121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100020099 and 1100020108.

It is not an unprimeable number, because it can be changed into a prime (1100020127) 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, 5339801 + ... + 5340006.

It is an arithmetic number, because the mean of its divisors is an integer number (277675008).

Almost surely, 2^1100020121 is an apocalyptic number.

It is an amenable number.

1100020121 is a deficient number, since it is larger than the sum of its proper divisors (10679911).

1100020121 is a wasteful number, since it uses less digits than its factorization.

1100020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10679910.

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

The square root of 1100020121 is about 33166.5512376551. The cubic root of 1100020121 is about 1032.2864095114.

Adding to 1100020121 its reverse (1210200011), we get a palindrome (2310220132).

The spelling of 1100020121 in words is "one billion, one hundred million, twenty thousand, one hundred twenty-one".