20214421 has 4 divisors (see below), whose sum is σ = 20911500. Its totient is φ = 19517344.

The previous prime is 20214413. The next prime is 20214427. The reversal of 20214421 is 12441202.

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 14333796 + 5880625 = 3786^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 20214421 - 2³ = 20214413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20214395 and 20214404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20214427) 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, 348496 + ... + 348553.

It is an arithmetic number, because the mean of its divisors is an integer number (5227875).

Almost surely, 2^20214421 is an apocalyptic number.

It is an amenable number.

20214421 is a deficient number, since it is larger than the sum of its proper divisors (697079).

20214421 is an equidigital number, since it uses as much as digits as its factorization.

20214421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697078.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20214421 is about 4496.0450398100. The cubic root of 20214421 is about 272.4083624200.

Adding to 20214421 its reverse (12441202), we get a palindrome (32655623).

The spelling of 20214421 in words is "twenty million, two hundred fourteen thousand, four hundred twenty-one".