1221201027 has 36 divisors (see below), whose sum is σ = 1811352816. Its totient is φ = 792776160.

The previous prime is 1221201019. The next prime is 1221201083. The reversal of 1221201027 is 7201021221.

It is a happy number.

It is not a de Polignac number, because 1221201027 - 2³ = 1221201019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221201097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6746877 + ... + 6747057.

It is an arithmetic number, because the mean of its divisors is an integer number (50315356).

Almost surely, 2^1221201027 is an apocalyptic number.

1221201027 is a deficient number, since it is larger than the sum of its proper divisors (590151789).

1221201027 is a wasteful number, since it uses less digits than its factorization.

1221201027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1221201027 is about 34945.6868153997. The cubic root of 1221201027 is about 1068.8802525973.

Adding to 1221201027 its reverse (7201021221), we get a palindrome (8422222248).

The spelling of 1221201027 in words is "one billion, two hundred twenty-one million, two hundred one thousand, twenty-seven".