1221231010 has 8 divisors (see below), whose sum is σ = 2198215836. Its totient is φ = 488492400.

The previous prime is 1221231001. The next prime is 1221231013. The reversal of 1221231010 is 101321221.

It can be written as a sum of positive squares in 2 ways, for example, as 1218917569 + 2313441 = 34913^2 + 1521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221231013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61061541 + ... + 61061560.

Almost surely, 2^1221231010 is an apocalyptic number.

1221231010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221231010 is a deficient number, since it is larger than the sum of its proper divisors (976984826).

1221231010 is a wasteful number, since it uses less digits than its factorization.

1221231010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122123108.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221231010 is about 34946.1158070536. The cubic root of 1221231010 is about 1068.8890002628.

Adding to 1221231010 its reverse (101321221), we get a palindrome (1322552231).

The spelling of 1221231010 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, ten".