1221121227 has 8 divisors (see below), whose sum is σ = 1631025360. Its totient is φ = 812648960.

The previous prime is 1221121199. The next prime is 1221121259. The reversal of 1221121227 is 7221211221.

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 1221121227 - 2²² = 1216926923 is a prime.

It is a super-2 number, since 2×1221121227² = 2982274102059971058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221121277) 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, 355974 + ... + 359387.

It is an arithmetic number, because the mean of its divisors is an integer number (203878170).

Almost surely, 2^1221121227 is an apocalyptic number.

1221121227 is a deficient number, since it is larger than the sum of its proper divisors (409904133).

1221121227 is an equidigital number, since it uses as much as digits as its factorization.

1221121227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715933.

The product of its digits is 224, while the sum is 21.

The square root of 1221121227 is about 34944.5450249392. The cubic root of 1221121227 is about 1068.8569699162.

Adding to 1221121227 its reverse (7221211221), we get a palindrome (8442332448).

The spelling of 1221121227 in words is "one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-seven".