20134421 has 4 divisors (see below), whose sum is σ = 20155200. Its totient is φ = 20113644.

The previous prime is 20134417. The next prime is 20134423. The reversal of 20134421 is 12443102.

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 20134421 - 2² = 20134417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20134421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20134423) 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, 8861 + ... + 10898.

It is an arithmetic number, because the mean of its divisors is an integer number (5038800).

Almost surely, 2^20134421 is an apocalyptic number.

It is an amenable number.

20134421 is a deficient number, since it is larger than the sum of its proper divisors (20779).

20134421 is a wasteful number, since it uses less digits than its factorization.

20134421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20778.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20134421 is about 4487.1395119831. The cubic root of 20134421 is about 272.0485288628.

Adding to 20134421 its reverse (12443102), we get a palindrome (32577523).

It can be divided in two parts, 201344 and 21, that multiplied together give a palindrome (4228224).

The spelling of 20134421 in words is "twenty million, one hundred thirty-four thousand, four hundred twenty-one".