1211152100 has 18 divisors (see below), whose sum is σ = 2628200274. Its totient is φ = 484460800.

The previous prime is 1211152069. The next prime is 1211152109. The reversal of 1211152100 is 12511121.

It can be written as a sum of positive squares in 3 ways, for example, as 327754816 + 883397284 = 18104^2 + 29722^2 .

It is not an unprimeable number, because it can be changed into a prime (1211152109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6055661 + ... + 6055860.

Almost surely, 2^1211152100 is an apocalyptic number.

1211152100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211152100 is an abundant number, since it is smaller than the sum of its proper divisors (1417048174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211152100 is a wasteful number, since it uses less digits than its factorization.

1211152100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12111535 (or 12111528 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 1211152100 is about 34801.6105949136. The cubic root of 1211152100 is about 1065.9403334328.

Adding to 1211152100 its reverse (12511121), we get a palindrome (1223663221).

The spelling of 1211152100 in words is "one billion, two hundred eleven million, one hundred fifty-two thousand, one hundred".