2123553421 has 4 divisors (see below), whose sum is σ = 2316603744. Its totient is φ = 1930503100.

The previous prime is 2123553353. The next prime is 2123553431. The reversal of 2123553421 is 1243553212.

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 not a de Polignac number, because 2123553421 - 2¹¹ = 2123551373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123553421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123553431) 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, 96525145 + ... + 96525166.

It is an arithmetic number, because the mean of its divisors is an integer number (579150936).

Almost surely, 2^2123553421 is an apocalyptic number.

It is an amenable number.

2123553421 is a deficient number, since it is larger than the sum of its proper divisors (193050323).

2123553421 is a wasteful number, since it uses less digits than its factorization.

2123553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193050322.

The product of its digits is 7200, while the sum is 28.

The square root of 2123553421 is about 46082.0292630435. The cubic root of 2123553421 is about 1285.3489987571.

The spelling of 2123553421 in words is "two billion, one hundred twenty-three million, five hundred fifty-three thousand, four hundred twenty-one".