21221322 has 16 divisors (see below), whose sum is σ = 42632352. Its totient is φ = 7042160.

The previous prime is 21221303. The next prime is 21221339. The reversal of 21221322 is 22312212.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

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, 6429 + ... + 9152.

It is an arithmetic number, because the mean of its divisors is an integer number (2664522).

Almost surely, 2^21221322 is an apocalyptic number.

21221322 is an abundant number, since it is smaller than the sum of its proper divisors (21411030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221322 is a wasteful number, since it uses less digits than its factorization.

21221322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15813.

The product of its digits is 96, while the sum is 15.

The square root of 21221322 is about 4606.6606126347. The cubic root of 21221322 is about 276.8582557089.

Adding to 21221322 its reverse (22312212), we get a palindrome (43533534).

The spelling of 21221322 in words is "twenty-one million, two hundred twenty-one thousand, three hundred twenty-two".