2102111001 has 16 divisors (see below), whose sum is σ = 3119294400. Its totient is φ = 1399132224.

The previous prime is 2102110949. The next prime is 2102111009. The reversal of 2102111001 is 1001112012.

It is a happy number.

It is not a de Polignac number, because 2102111001 - 2⁶ = 2102110937 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 (2102111009) 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, 46176 + ... + 79601.

It is an arithmetic number, because the mean of its divisors is an integer number (194955900).

Almost surely, 2^2102111001 is an apocalyptic number.

It is an amenable number.

2102111001 is a deficient number, since it is larger than the sum of its proper divisors (1017183399).

2102111001 is a wasteful number, since it uses less digits than its factorization.

2102111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126405 (or 126399 counting only the distinct ones).

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

The square root of 2102111001 is about 45848.7840732990. The cubic root of 2102111001 is about 1281.0081171433.

Adding to 2102111001 its reverse (1001112012), we get a palindrome (3103223013).

The spelling of 2102111001 in words is "two billion, one hundred two million, one hundred eleven thousand, one".