21020322 has 16 divisors (see below), whose sum is σ = 42458112. Its totient is φ = 6937200.

The previous prime is 21020303. The next prime is 21020339. The reversal of 21020322 is 22302012.

It is a junction number, because it is equal to n+sod(n) for n = 21020298 and 21020307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16738 + ... + 17949.

It is an arithmetic number, because the mean of its divisors is an integer number (2653632).

Almost surely, 2^21020322 is an apocalyptic number.

21020322 is an abundant number, since it is smaller than the sum of its proper divisors (21437790).

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

21020322 is a wasteful number, since it uses less digits than its factorization.

21020322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34793.

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

The square root of 21020322 is about 4584.7924707668. The cubic root of 21020322 is about 275.9813839576.

Adding to 21020322 its reverse (22302012), we get a palindrome (43322334).

The spelling of 21020322 in words is "twenty-one million, twenty thousand, three hundred twenty-two".