1221412277 has 8 divisors (see below), whose sum is σ = 1315180800. Its totient is φ = 1130079424.

The previous prime is 1221412271. The next prime is 1221412319. The reversal of 1221412277 is 7722141221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221412277 - 2⁸ = 1221412021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221412271) 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, 607877 + ... + 609882.

It is an arithmetic number, because the mean of its divisors is an integer number (164397600).

Almost surely, 2^1221412277 is an apocalyptic number.

1221412277 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1221412277 is a deficient number, since it is larger than the sum of its proper divisors (93768523).

1221412277 is a wasteful number, since it uses less digits than its factorization.

1221412277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217835.

The product of its digits is 3136, while the sum is 29.

The square root of 1221412277 is about 34948.7092322449. The cubic root of 1221412277 is about 1068.9418826182.

Adding to 1221412277 its reverse (7722141221), we get a palindrome (8943553498).

The spelling of 1221412277 in words is "one billion, two hundred twenty-one million, four hundred twelve thousand, two hundred seventy-seven".