2100421111 has 32 divisors (see below), whose sum is σ = 2396252160. Its totient is φ = 1830326784.

The previous prime is 2100421087. The next prime is 2100421159. The reversal of 2100421111 is 1111240012.

It is a cyclic number.

It is not a de Polignac number, because 2100421111 - 2²⁷ = 1966203383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100421091 and 2100421100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100421511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1636476 + ... + 1637758.

It is an arithmetic number, because the mean of its divisors is an integer number (74882880).

Almost surely, 2^2100421111 is an apocalyptic number.

2100421111 is a deficient number, since it is larger than the sum of its proper divisors (295831049).

2100421111 is a wasteful number, since it uses less digits than its factorization.

2100421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2100421111 is about 45830.3514169377. The cubic root of 2100421111 is about 1280.6647570400.

Adding to 2100421111 its reverse (1111240012), we get a palindrome (3211661123).

The spelling of 2100421111 in words is "two billion, one hundred million, four hundred twenty-one thousand, one hundred eleven".