2111201001 has 48 divisors (see below), whose sum is σ = 3774476160. Its totient is φ = 1107302400.

The previous prime is 2111200997. The next prime is 2111201009. The reversal of 2111201001 is 1001021112.

It is a happy number.

It is not a de Polignac number, because 2111201001 - 2² = 2111200997 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2111201009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139401 + ... + 153801.

It is an arithmetic number, because the mean of its divisors is an integer number (78634920).

Almost surely, 2^2111201001 is an apocalyptic number.

2111201001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2111201001 is a deficient number, since it is larger than the sum of its proper divisors (1663275159).

2111201001 is a wasteful number, since it uses less digits than its factorization.

2111201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14606 (or 14603 counting only the distinct ones).

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

The square root of 2111201001 is about 45947.8073579143. The cubic root of 2111201001 is about 1282.8519176061.

Adding to 2111201001 its reverse (1001021112), we get a palindrome (3112222113).

The spelling of 2111201001 in words is "two billion, one hundred eleven million, two hundred one thousand, one".