1221204470 has 16 divisors (see below), whose sum is σ = 2203549920. Its totient is φ = 487285824.

The previous prime is 1221204449. The next prime is 1221204487. The reversal of 1221204470 is 744021221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145202 + ... + 153381.

It is an arithmetic number, because the mean of its divisors is an integer number (137721870).

Almost surely, 2^1221204470 is an apocalyptic number.

1221204470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221204470 is a deficient number, since it is larger than the sum of its proper divisors (982345450).

1221204470 is a wasteful number, since it uses less digits than its factorization.

1221204470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298999.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 1221204470 is about 34945.7360775245. The cubic root of 1221204470 is about 1068.8812571142.

Adding to 1221204470 its reverse (744021221), we get a palindrome (1965225691).

The spelling of 1221204470 in words is "one billion, two hundred twenty-one million, two hundred four thousand, four hundred seventy".