2141123021 has 4 divisors (see below), whose sum is σ = 2267071452. Its totient is φ = 2015174592.

The previous prime is 2141123009. The next prime is 2141123051. The reversal of 2141123021 is 1203211412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2003905225 + 137217796 = 44765^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2141123021 - 2⁶ = 2141122957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 125948413 = 2141123021 / (2 + 1 + 4 + 1 + 1 + 2 + 3 + 0 + 2 + 1).

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 (2141123051) 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, 62974190 + ... + 62974223.

It is an arithmetic number, because the mean of its divisors is an integer number (566767863).

Almost surely, 2^2141123021 is an apocalyptic number.

It is an amenable number.

2141123021 is a deficient number, since it is larger than the sum of its proper divisors (125948431).

2141123021 is a wasteful number, since it uses less digits than its factorization.

2141123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125948430.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2141123021 is about 46272.2705407893. The cubic root of 2141123021 is about 1288.8841222544.

Adding to 2141123021 its reverse (1203211412), we get a palindrome (3344334433).

The spelling of 2141123021 in words is "two billion, one hundred forty-one million, one hundred twenty-three thousand, twenty-one".