1211151103 has 16 divisors (see below), whose sum is σ = 1243821600. Its totient is φ = 1179035136.

The previous prime is 1211151079. The next prime is 1211151107. The reversal of 1211151103 is 3011511121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211151103 - 2²⁵ = 1177596671 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 (1211151107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3470173 + ... + 3470521.

It is an arithmetic number, because the mean of its divisors is an integer number (77738850).

Almost surely, 2^1211151103 is an apocalyptic number.

1211151103 is a deficient number, since it is larger than the sum of its proper divisors (32670497).

1211151103 is a wasteful number, since it uses less digits than its factorization.

1211151103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 30, while the sum is 16.

The square root of 1211151103 is about 34801.5962708609. The cubic root of 1211151103 is about 1065.9400409447.

Adding to 1211151103 its reverse (3011511121), we get a palindrome (4222662224).

The spelling of 1211151103 in words is "one billion, two hundred eleven million, one hundred fifty-one thousand, one hundred three".