2141919821 has 4 divisors (see below), whose sum is σ = 2142012444. Its totient is φ = 2141827200.

The previous prime is 2141919803. The next prime is 2141919833. The reversal of 2141919821 is 1289191412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1073545225 + 1068374596 = 32765^2 + 32686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2141919821 - 2¹⁸ = 2141657677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2141919841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20651 + ... + 68631.

It is an arithmetic number, because the mean of its divisors is an integer number (535503111).

Almost surely, 2^2141919821 is an apocalyptic number.

It is an amenable number.

2141919821 is a deficient number, since it is larger than the sum of its proper divisors (92623).

2141919821 is an equidigital number, since it uses as much as digits as its factorization.

2141919821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92622.

The product of its digits is 10368, while the sum is 38.

The square root of 2141919821 is about 46280.8796480793. The cubic root of 2141919821 is about 1289.0439847021.

The spelling of 2141919821 in words is "two billion, one hundred forty-one million, nine hundred nineteen thousand, eight hundred twenty-one".