53123421 has 16 divisors (see below), whose sum is σ = 76463744. Its totient is φ = 32612544.

The previous prime is 53123401. The next prime is 53123431. The reversal of 53123421 is 12432135.

It is not a de Polignac number, because 53123421 - 2¹³ = 53115229 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 (53123401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17595 + ... + 20391.

It is an arithmetic number, because the mean of its divisors is an integer number (4778984).

Almost surely, 2^53123421 is an apocalyptic number.

It is an amenable number.

53123421 is a deficient number, since it is larger than the sum of its proper divisors (23340323).

53123421 is a wasteful number, since it uses less digits than its factorization.

53123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300.

The product of its digits is 720, while the sum is 21.

The square root of 53123421 is about 7288.5815492454. The cubic root of 53123421 is about 375.9199245692.

Adding to 53123421 its reverse (12432135), we get a palindrome (65555556).

The spelling of 53123421 in words is "fifty-three million, one hundred twenty-three thousand, four hundred twenty-one".