21321022 has 4 divisors (see below), whose sum is σ = 31981536. Its totient is φ = 10660510.

The previous prime is 21321019. The next prime is 21321031. The reversal of 21321022 is 22012312.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21320993 and 21321011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330254 + ... + 5330257.

It is an arithmetic number, because the mean of its divisors is an integer number (7995384).

Almost surely, 2^21321022 is an apocalyptic number.

21321022 is a deficient number, since it is larger than the sum of its proper divisors (10660514).

21321022 is a wasteful number, since it uses less digits than its factorization.

21321022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660513.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21321022 is about 4617.4692202547. The cubic root of 21321022 is about 277.2911482130.

Adding to 21321022 its reverse (22012312), we get a palindrome (43333334).

The spelling of 21321022 in words is "twenty-one million, three hundred twenty-one thousand, twenty-two".