21222446 has 16 divisors (see below), whose sum is σ = 36625920. Its totient is φ = 9034200.

The previous prime is 21222433. The next prime is 21222469. The reversal of 21222446 is 64422212.

It is a super-3 number, since 3×21222446³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

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, 2906 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (2289120).

Almost surely, 2^21222446 is an apocalyptic number.

21222446 is a deficient number, since it is larger than the sum of its proper divisors (15403474).

21222446 is a wasteful number, since it uses less digits than its factorization.

21222446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199.

The product of its digits is 1536, while the sum is 23.

The square root of 21222446 is about 4606.7826082853. The cubic root of 21222446 is about 276.8631436102.

Adding to 21222446 its reverse (64422212), we get a palindrome (85644658).

The spelling of 21222446 in words is "twenty-one million, two hundred twenty-two thousand, four hundred forty-six".