1220621226 has 16 divisors (see below), whose sum is σ = 2663173728. Its totient is φ = 369885200.

The previous prime is 1220621221. The next prime is 1220621251. The reversal of 1220621226 is 6221260221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220621196 and 1220621205.

It is not an unprimeable number, because it can be changed into a prime (1220621221) 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, 9247065 + ... + 9247196.

It is an arithmetic number, because the mean of its divisors is an integer number (166448358).

Almost surely, 2^1220621226 is an apocalyptic number.

1220621226 is an abundant number, since it is smaller than the sum of its proper divisors (1442552502).

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

1220621226 is a wasteful number, since it uses less digits than its factorization.

1220621226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18494277.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1220621226 is about 34937.3900856947. The cubic root of 1220621226 is about 1068.7110650704.

Adding to 1220621226 its reverse (6221260221), we get a palindrome (7441881447).

The spelling of 1220621226 in words is "one billion, two hundred twenty million, six hundred twenty-one thousand, two hundred twenty-six".