1221544010 has 64 divisors (see below), whose sum is σ = 2458771200. Its totient is φ = 434230272.

The previous prime is 1221544001. The next prime is 1221544013. The reversal of 1221544010 is 104451221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221544013) 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 31 ways as a sum of consecutive naturals, for example, 1643699 + ... + 1644441.

It is an arithmetic number, because the mean of its divisors is an integer number (38418300).

Almost surely, 2^1221544010 is an apocalyptic number.

1221544010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221544010 is an abundant number, since it is smaller than the sum of its proper divisors (1237227190).

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

1221544010 is a wasteful number, since it uses less digits than its factorization.

1221544010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1221544010 is about 34950.5938433097. The cubic root of 1221544010 is about 1068.9803107727.

Adding to 1221544010 its reverse (104451221), we get a palindrome (1325995231).

The spelling of 1221544010 in words is "one billion, two hundred twenty-one million, five hundred forty-four thousand, ten".