20214021 has 4 divisors (see below), whose sum is σ = 26952032. Its totient is φ = 13476012.

The previous prime is 20214017. The next prime is 20214023. The reversal of 20214021 is 12041202.

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 20214021 - 2² = 20214017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213988 and 20214006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20214023) 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, 3369001 + ... + 3369006.

It is an arithmetic number, because the mean of its divisors is an integer number (6738008).

Almost surely, 2^20214021 is an apocalyptic number.

It is an amenable number.

20214021 is a deficient number, since it is larger than the sum of its proper divisors (6738011).

20214021 is an equidigital number, since it uses as much as digits as its factorization.

20214021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738010.

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

The square root of 20214021 is about 4496.0005560498. Note that the first 3 decimals coincide. The cubic root of 20214021 is about 272.4065656159.

Adding to 20214021 its reverse (12041202), we get a palindrome (32255223).

The spelling of 20214021 in words is "twenty million, two hundred fourteen thousand, twenty-one".