1221406326 has 48 divisors (see below), whose sum is σ = 3067054848. Its totient is φ = 344055600.

The previous prime is 1221406247. The next prime is 1221406331. The reversal of 1221406326 is 6236041221.

1221406326 is a `hidden beast` number, since 1 + 2 + 21 + 4 + 0 + 632 + 6 = 666.

1221406326 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1221406326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59320 + ... + 77211.

It is an arithmetic number, because the mean of its divisors is an integer number (63896976).

Almost surely, 2^1221406326 is an apocalyptic number.

1221406326 is an abundant number, since it is smaller than the sum of its proper divisors (1845648522).

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

1221406326 is a wasteful number, since it uses less digits than its factorization.

1221406326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136617 (or 136614 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1221406326 is about 34948.6240930884. The cubic root of 1221406326 is about 1068.9401465723.

Adding to 1221406326 its reverse (6236041221), we get a palindrome (7457447547).

The spelling of 1221406326 in words is "one billion, two hundred twenty-one million, four hundred six thousand, three hundred twenty-six".