22121210 has 16 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 8826576.

The previous prime is 22121201. The next prime is 22121213. The reversal of 22121210 is 1212122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22121191 and 22121200.

It is not an unprimeable number, because it can be changed into a prime (22121213) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1871 + ... + 6909.

It is an arithmetic number, because the mean of its divisors is an integer number (2494800).

Almost surely, 2^22121210 is an apocalyptic number.

22121210 is a deficient number, since it is larger than the sum of its proper divisors (17795590).

22121210 is a wasteful number, since it uses less digits than its factorization.

22121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 22121210 is about 4703.3190408476. The cubic root of 22121210 is about 280.7175896478.

Adding to 22121210 its product of nonzero digits (16), we get a triangular number (22121226 = T₆₆₅₁).

Adding to 22121210 its reverse (1212122), we get a palindrome (23333332).

It can be divided in two parts, 2 and 2121210, that added together give a palindrome (2121212).

The spelling of 22121210 in words is "twenty-two million, one hundred twenty-one thousand, two hundred ten".