20201421 has 4 divisors (see below), whose sum is σ = 26935232. Its totient is φ = 13467612.

The previous prime is 20201407. The next prime is 20201437. The reversal of 20201421 is 12410202.

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 not a de Polignac number, because 20201421 - 2¹⁸ = 19939277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201397 and 20201406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201021) 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, 3366901 + ... + 3366906.

It is an arithmetic number, because the mean of its divisors is an integer number (6733808).

Almost surely, 2^20201421 is an apocalyptic number.

It is an amenable number.

20201421 is a deficient number, since it is larger than the sum of its proper divisors (6733811).

20201421 is an equidigital number, since it uses as much as digits as its factorization.

20201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733810.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20201421 is about 4494.5990922439. The cubic root of 20201421 is about 272.3499541492.

Adding to 20201421 its reverse (12410202), we get a palindrome (32611623).

The spelling of 20201421 in words is "twenty million, two hundred one thousand, four hundred twenty-one".