22031331 has 12 divisors (see below), whose sum is σ = 34171272. Its totient is φ = 12589248.

The previous prime is 22031311. The next prime is 22031333. The reversal of 22031331 is 13313022.

It is not a de Polignac number, because 22031331 - 2⁵ = 22031299 is a prime.

It is a super-2 number, since 2×22031331² = 970759091263122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22031331.

It is not an unprimeable number, because it can be changed into a prime (22031333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74790 + ... + 75083.

It is an arithmetic number, because the mean of its divisors is an integer number (2847606).

Almost surely, 2^22031331 is an apocalyptic number.

22031331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22031331 is a deficient number, since it is larger than the sum of its proper divisors (12139941).

22031331 is a wasteful number, since it uses less digits than its factorization.

22031331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149890 (or 149883 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 22031331 is about 4693.7544673747. The cubic root of 22031331 is about 280.3368861745.

Adding to 22031331 its reverse (13313022), we get a palindrome (35344353).

The spelling of 22031331 in words is "twenty-two million, thirty-one thousand, three hundred thirty-one".