1211221255 has 8 divisors (see below), whose sum is σ = 1484390592. Its totient is φ = 948360288.

The previous prime is 1211221237. The next prime is 1211221309. The reversal of 1211221255 is 5521221121.

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 1211221255 - 2¹³ = 1211213063 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2576832 + ... + 2577301.

It is an arithmetic number, because the mean of its divisors is an integer number (185548824).

Almost surely, 2^1211221255 is an apocalyptic number.

1211221255 is a deficient number, since it is larger than the sum of its proper divisors (273169337).

1211221255 is an equidigital number, since it uses as much as digits as its factorization.

1211221255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154185.

The product of its digits is 400, while the sum is 22.

The square root of 1211221255 is about 34802.6041410697. The cubic root of 1211221255 is about 1065.9606209207.

Adding to 1211221255 its reverse (5521221121), we get a palindrome (6732442376).

The spelling of 1211221255 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred fifty-five".