1221504010 has 64 divisors (see below), whose sum is σ = 2370601728. Its totient is φ = 452035584.

The previous prime is 1221503981. The next prime is 1221504023. The reversal of 1221504010 is 104051221.

It is an unprimeable number.

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, 1117024 + ... + 1118116.

It is an arithmetic number, because the mean of its divisors is an integer number (37040652).

Almost surely, 2^1221504010 is an apocalyptic number.

1221504010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221504010 is a deficient number, since it is larger than the sum of its proper divisors (1149097718).

1221504010 is a wasteful number, since it uses less digits than its factorization.

1221504010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1221504010 is about 34950.0216022823. The cubic root of 1221504010 is about 1068.9686425673.

Adding to 1221504010 its reverse (104051221), we get a palindrome (1325555231).

The spelling of 1221504010 in words is "one billion, two hundred twenty-one million, five hundred four thousand, ten".