21002322 has 32 divisors (see below), whose sum is σ = 47407680. Its totient is φ = 6144320.

The previous prime is 21002299. The next prime is 21002323. The reversal of 21002322 is 22320012.

It is a junction number, because it is equal to n+sod(n) for n = 21002298 and 21002307.

It is not an unprimeable number, because it can be changed into a prime (21002323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3573 + ... + 7400.

It is an arithmetic number, because the mean of its divisors is an integer number (1481490).

Almost surely, 2^21002322 is an apocalyptic number.

21002322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21002322 is an abundant number, since it is smaller than the sum of its proper divisors (26405358).

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

21002322 is a wasteful number, since it uses less digits than its factorization.

21002322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11018.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21002322 is about 4582.8290389234. The cubic root of 21002322 is about 275.9025858696.

Adding to 21002322 its reverse (22320012), we get a palindrome (43322334).

The spelling of 21002322 in words is "twenty-one million, two thousand, three hundred twenty-two".