2100140021 has 4 divisors (see below), whose sum is σ = 2400160032. Its totient is φ = 1800120012.

The previous prime is 2100140011. The next prime is 2100140023. The reversal of 2100140021 is 1200410012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100140021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100139984 and 2100140011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100140023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150009995 + ... + 150010008.

It is an arithmetic number, because the mean of its divisors is an integer number (600040008).

Almost surely, 2^2100140021 is an apocalyptic number.

It is an amenable number.

2100140021 is a deficient number, since it is larger than the sum of its proper divisors (300020011).

2100140021 is an equidigital number, since it uses as much as digits as its factorization.

2100140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300020010.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2100140021 is about 45827.2846784533. The cubic root of 2100140021 is about 1280.6076259383.

Adding to 2100140021 its reverse (1200410012), we get a palindrome (3300550033).

The spelling of 2100140021 in words is "two billion, one hundred million, one hundred forty thousand, twenty-one".