1211231101 has 8 divisors (see below), whose sum is σ = 1273895424. Its totient is φ = 1150041360.

The previous prime is 1211231093. The next prime is 1211231117. The reversal of 1211231101 is 1011321121.

It is a happy number.

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 1211231101 - 2³ = 1211231093 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 (1211231401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366961 + ... + 370246.

It is an arithmetic number, because the mean of its divisors is an integer number (159236928).

Almost surely, 2^1211231101 is an apocalyptic number.

It is an amenable number.

1211231101 is a deficient number, since it is larger than the sum of its proper divisors (62664323).

1211231101 is an equidigital number, since it uses as much as digits as its factorization.

1211231101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737291.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211231101 is about 34802.7455957141. The cubic root of 1211231101 is about 1065.9635093057.

Adding to 1211231101 its reverse (1011321121), we get a palindrome (2222552222).

The spelling of 1211231101 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, one hundred one".