1221277130 has 16 divisors (see below), whose sum is σ = 2257713000. Its totient is φ = 475307712.

The previous prime is 1221277103. The next prime is 1221277199. The reversal of 1221277130 is 317721221.

It can be written as a sum of positive squares in 4 ways, for example, as 1215289321 + 5987809 = 34861^2 + 2447^2 .

It is a super-2 number, since 2×1221277130² = 2983035656522073800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221277130.

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, 1650005 + ... + 1650744.

Almost surely, 2^1221277130 is an apocalyptic number.

1221277130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221277130 is a deficient number, since it is larger than the sum of its proper divisors (1036435870).

1221277130 is a wasteful number, since it uses less digits than its factorization.

1221277130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300793.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 1221277130 is about 34946.7756738730. The cubic root of 1221277130 is about 1068.9024556860.

Adding to 1221277130 its reverse (317721221), we get a palindrome (1538998351).

The spelling of 1221277130 in words is "one billion, two hundred twenty-one million, two hundred seventy-seven thousand, one hundred thirty".