1211101002 has 48 divisors (see below), whose sum is σ = 2769361920. Its totient is φ = 381456000.

The previous prime is 1211100997. The next prime is 1211101019. The reversal of 1211101002 is 2001011121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 132727 + ... + 141557.

It is an arithmetic number, because the mean of its divisors is an integer number (57695040).

Almost surely, 2^1211101002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211101002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1384680960).

1211101002 is an abundant number, since it is smaller than the sum of its proper divisors (1558260918).

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

1211101002 is a wasteful number, since it uses less digits than its factorization.

1211101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9259 (or 9256 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1211101002 is about 34800.8764544803. The cubic root of 1211101002 is about 1065.9253426965.

Adding to 1211101002 its reverse (2001011121), we get a palindrome (3212112123).

The spelling of 1211101002 in words is "one billion, two hundred eleven million, one hundred one thousand, two".