20222421 has 4 divisors (see below), whose sum is σ = 26963232. Its totient is φ = 13481612.

The previous prime is 20222413. The next prime is 20222437. The reversal of 20222421 is 12422202.

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 20222421 - 2³ = 20222413 is a prime.

It is a super-2 number, since 2×20222421² = 817892622202482, which contains 22 as substring.

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 20222421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222021) 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, 3370401 + ... + 3370406.

It is an arithmetic number, because the mean of its divisors is an integer number (6740808).

Almost surely, 2^20222421 is an apocalyptic number.

It is an amenable number.

20222421 is a deficient number, since it is larger than the sum of its proper divisors (6740811).

20222421 is an equidigital number, since it uses as much as digits as its factorization.

20222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6740810.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20222421 is about 4496.9346226068. The cubic root of 20222421 is about 272.4442935255. Note that the first 3 decimals are identical.

Adding to 20222421 its reverse (12422202), we get a palindrome (32644623).

The spelling of 20222421 in words is "twenty million, two hundred twenty-two thousand, four hundred twenty-one".