21206022 has 8 divisors (see below), whose sum is σ = 42412056. Its totient is φ = 7068672.

The previous prime is 21206011. The next prime is 21206117. The reversal of 21206022 is 22060212.

It is a sphenic number, since it is the product of 3 distinct primes.

21206022 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21205992 and 21206010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767163 + ... + 1767174.

It is an arithmetic number, because the mean of its divisors is an integer number (5301507).

Almost surely, 2^21206022 is an apocalyptic number.

21206022 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21206022 is a wasteful number, since it uses less digits than its factorization.

21206022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3534342.

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

The square root of 21206022 is about 4604.9996742671. Note that the first 3 decimals coincide. The cubic root of 21206022 is about 276.7917039374.

Adding to 21206022 its reverse (22060212), we get a palindrome (43266234).

The spelling of 21206022 in words is "twenty-one million, two hundred six thousand, twenty-two".