22021331 has 2 divisors, whose sum is σ = 22021332. Its totient is φ = 22021330.

The previous prime is 22021319. The next prime is 22021357. The reversal of 22021331 is 13312022.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22021331 - 2⁶ = 22021267 is a prime.

It is a super-2 number, since 2×22021331² = 969878038023122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22021301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010665 + 11010666.

It is an arithmetic number, because the mean of its divisors is an integer number (11010666).

Almost surely, 2^22021331 is an apocalyptic number.

22021331 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021331 is an equidigital number, since it uses as much as digits as its factorization.

22021331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 22021331 is about 4692.6891011445. The cubic root of 22021331 is about 280.2944648743.

Adding to 22021331 its reverse (13312022), we get a palindrome (35333353).

The spelling of 22021331 in words is "twenty-two million, twenty-one thousand, three hundred thirty-one".