20421119 has 4 divisors (see below), whose sum is σ = 20631744. Its totient is φ = 20210496.

The previous prime is 20421103. The next prime is 20421179. The reversal of 20421119 is 91112402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20421119 - 2⁴ = 20421103 is a prime.

It is a super-2 number, since 2×20421119² = 834044202424322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20421119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421179) 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, 105167 + ... + 105360.

It is an arithmetic number, because the mean of its divisors is an integer number (5157936).

Almost surely, 2^20421119 is an apocalyptic number.

20421119 is a deficient number, since it is larger than the sum of its proper divisors (210625).

20421119 is an equidigital number, since it uses as much as digits as its factorization.

20421119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210624.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20421119 is about 4518.9732240853. The cubic root of 20421119 is about 273.3336990213. Note that the first 3 decimals are identical.

The spelling of 20421119 in words is "twenty million, four hundred twenty-one thousand, one hundred nineteen".