21231322 has 16 divisors (see below), whose sum is σ = 38312640. Its totient is φ = 8620128.

The previous prime is 21231313. The next prime is 21231359. The reversal of 21231322 is 22313212.

It is a junction number, because it is equal to n+sod(n) for n = 21231296 and 21231305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39643 + ... + 40174.

It is an arithmetic number, because the mean of its divisors is an integer number (2394540).

Almost surely, 2^21231322 is an apocalyptic number.

21231322 is a deficient number, since it is larger than the sum of its proper divisors (17081318).

21231322 is a wasteful number, since it uses less digits than its factorization.

21231322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79845.

The product of its digits is 144, while the sum is 16.

The square root of 21231322 is about 4607.7458697285. The cubic root of 21231322 is about 276.9017363145.

Adding to 21231322 its reverse (22313212), we get a palindrome (43544534).

The spelling of 21231322 in words is "twenty-one million, two hundred thirty-one thousand, three hundred twenty-two".