20223021 has 16 divisors (see below), whose sum is σ = 33186944. Its totient is φ = 10666944.

The previous prime is 20222987. The next prime is 20223023. The reversal of 20223021 is 12032202.

It is not a de Polignac number, because 20223021 - 2¹³ = 20214829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20222988 and 20223006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20223023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36766 + ... + 37311.

It is an arithmetic number, because the mean of its divisors is an integer number (2074184).

Almost surely, 2^20223021 is an apocalyptic number.

20223021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20223021 is a deficient number, since it is larger than the sum of its proper divisors (12963923).

20223021 is a wasteful number, since it uses less digits than its factorization.

20223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74100.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20223021 is about 4497.0013342226. The cubic root of 20223021 is about 272.4469879763.

Subtracting from 20223021 its sum of digits (12), we obtain a square (20223009 = 4497²).

Adding to 20223021 its reverse (12032202), we get a palindrome (32255223).

The spelling of 20223021 in words is "twenty million, two hundred twenty-three thousand, twenty-one".