2143023421 has 32 divisors (see below), whose sum is σ = 2738442240. Its totient is φ = 1628510400.

The previous prime is 2143023419. The next prime is 2143023427. The reversal of 2143023421 is 1243203412.

It is not a de Polignac number, because 2143023421 - 2¹ = 2143023419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2143023392 and 2143023401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143023427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1196995 + ... + 1198783.

It is an arithmetic number, because the mean of its divisors is an integer number (85576320).

Almost surely, 2^2143023421 is an apocalyptic number.

It is an amenable number.

2143023421 is a deficient number, since it is larger than the sum of its proper divisors (595418819).

2143023421 is a wasteful number, since it uses less digits than its factorization.

2143023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 2143023421 is about 46292.8009630007. The cubic root of 2143023421 is about 1289.2653351425.

Adding to 2143023421 its reverse (1243203412), we get a palindrome (3386226833).

Subtracting from 2143023421 its reverse (1243203412), we obtain a square (899820009 = 29997²).

The spelling of 2143023421 in words is "two billion, one hundred forty-three million, twenty-three thousand, four hundred twenty-one".