21222410 has 16 divisors (see below), whose sum is σ = 41673312. Its totient is φ = 7717200.

The previous prime is 21222401. The next prime is 21222433. The reversal of 21222410 is 1422212.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96356 + ... + 96575.

It is an arithmetic number, because the mean of its divisors is an integer number (2604582).

Almost surely, 2^21222410 is an apocalyptic number.

21222410 is a deficient number, since it is larger than the sum of its proper divisors (20450902).

21222410 is a wasteful number, since it uses less digits than its factorization.

21222410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192949.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21222410 is about 4606.7787010014. The cubic root of 21222410 is about 276.8629870609.

Adding to 21222410 its reverse (1422212), we get a palindrome (22644622).

It can be divided in two parts, 212 and 22410, that added together give a palindrome (22622).

The spelling of 21222410 in words is "twenty-one million, two hundred twenty-two thousand, four hundred ten".