1100122121 has 4 divisors (see below), whose sum is σ = 1257282432. Its totient is φ = 942961812.

The previous prime is 1100122117. The next prime is 1100122123. The reversal of 1100122121 is 1212210011.

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: 1212210011 = 53 ⋅22871887.

It is a cyclic number.

It is not a de Polignac number, because 1100122121 - 2² = 1100122117 is a prime.

It is a super-2 number, since 2×1100122121² = 2420537362227077282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1100122123) 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, 78580145 + ... + 78580158.

It is an arithmetic number, because the mean of its divisors is an integer number (314320608).

Almost surely, 2^1100122121 is an apocalyptic number.

It is an amenable number.

1100122121 is a deficient number, since it is larger than the sum of its proper divisors (157160311).

1100122121 is an equidigital number, since it uses as much as digits as its factorization.

1100122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157160310.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1100122121 is about 33168.0888958047. The cubic root of 1100122121 is about 1032.3183149761.

Adding to 1100122121 its reverse (1212210011), we get a palindrome (2312332132).

The spelling of 1100122121 in words is "one billion, one hundred million, one hundred twenty-two thousand, one hundred twenty-one".