2123013421 has 4 divisors (see below), whose sum is σ = 2163070332. Its totient is φ = 2082956512.

The previous prime is 2123013401. The next prime is 2123013433. The reversal of 2123013421 is 1243103212.

It is a happy number.

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 1837065321 + 285948100 = 42861^2 + 16910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123013421 - 2¹⁹ = 2122489133 is a prime.

It is a super-2 number, since 2×2123013421² = 9014371971492246482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123013401) 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, 20028376 + ... + 20028481.

It is an arithmetic number, because the mean of its divisors is an integer number (540767583).

Almost surely, 2^2123013421 is an apocalyptic number.

It is an amenable number.

2123013421 is a deficient number, since it is larger than the sum of its proper divisors (40056911).

2123013421 is an equidigital number, since it uses as much as digits as its factorization.

2123013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40056910.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2123013421 is about 46076.1697735391. The cubic root of 2123013421 is about 1285.2400387322.

Adding to 2123013421 its reverse (1243103212), we get a palindrome (3366116633).

The spelling of 2123013421 in words is "two billion, one hundred twenty-three million, thirteen thousand, four hundred twenty-one".