22312021 has 4 divisors (see below), whose sum is σ = 22404844. Its totient is φ = 22219200.

The previous prime is 22312019. The next prime is 22312063. The reversal of 22312021 is 12021322.

22312021 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12021322 = 2 ⋅6010661.

It can be written as a sum of positive squares in 2 ways, for example, as 9991921 + 12320100 = 3161^2 + 3510^2 .

It is a cyclic number.

It is not a de Polignac number, because 22312021 - 2¹ = 22312019 is a prime.

It is a super-3 number, since 3×22312021³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22311992 and 22312010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22312091) 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, 46050 + ... + 46531.

It is an arithmetic number, because the mean of its divisors is an integer number (5601211).

Almost surely, 2^22312021 is an apocalyptic number.

It is an amenable number.

22312021 is a deficient number, since it is larger than the sum of its proper divisors (92823).

22312021 is an equidigital number, since it uses as much as digits as its factorization.

22312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92822.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 22312021 is about 4723.5602039140. The cubic root of 22312021 is about 281.5224089250.

Adding to 22312021 its reverse (12021322), we get a palindrome (34333343).

The spelling of 22312021 in words is "twenty-two million, three hundred twelve thousand, twenty-one".