1221268190 has 16 divisors (see below), whose sum is σ = 2234321280. Its totient is φ = 480498720.

The previous prime is 1221268183. The next prime is 1221268193. The reversal of 1221268190 is 918621221.

It is a super-2 number, since 2×1221268190² = 2982991983811752200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221268193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000430 + ... + 1001649.

It is an arithmetic number, because the mean of its divisors is an integer number (139645080).

Almost surely, 2^1221268190 is an apocalyptic number.

1221268190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221268190 is a deficient number, since it is larger than the sum of its proper divisors (1013053090).

1221268190 is a wasteful number, since it uses less digits than its factorization.

1221268190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002147.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1221268190 is about 34946.6477648429. The cubic root of 1221268190 is about 1068.8998474843.

The spelling of 1221268190 in words is "one billion, two hundred twenty-one million, two hundred sixty-eight thousand, one hundred ninety".