1211121101 has 8 divisors (see below), whose sum is σ = 1239754560. Its totient is φ = 1182508992.

The previous prime is 1211121091. The next prime is 1211121139. The reversal of 1211121101 is 1011211121.

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 1211121101 - 2¹⁴ = 1211104717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121601) 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, 212576 + ... + 218198.

It is an arithmetic number, because the mean of its divisors is an integer number (154969320).

Almost surely, 2^1211121101 is an apocalyptic number.

It is an amenable number.

1211121101 is a deficient number, since it is larger than the sum of its proper divisors (28633459).

1211121101 is an equidigital number, since it uses as much as digits as its factorization.

1211121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1211121101 is about 34801.1652247450. The cubic root of 1211121101 is about 1065.9312392361.

Adding to 1211121101 its reverse (1011211121), we get a palindrome (2222332222).

It can be divided in two parts, 1211121 and 101, that multiplied together give a palindrome (122323221).

The spelling of 1211121101 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred one".