1222101555 has 16 divisors (see below), whose sum is σ = 2003055264. Its totient is φ = 635889920.

The previous prime is 1222101553. The next prime is 1222101599. The reversal of 1222101555 is 5551012221.

It is not a de Polignac number, because 1222101555 - 2¹ = 1222101553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222101553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992964 + ... + 994193.

It is an arithmetic number, because the mean of its divisors is an integer number (125190954).

Almost surely, 2^1222101555 is an apocalyptic number.

1222101555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1222101555 is a deficient number, since it is larger than the sum of its proper divisors (780953709).

1222101555 is a wasteful number, since it uses less digits than its factorization.

1222101555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987206.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 1222101555 is about 34958.5691211754. The cubic root of 1222101555 is about 1069.1429229990.

Adding to 1222101555 its reverse (5551012221), we get a palindrome (6773113776).

The spelling of 1222101555 in words is "one billion, two hundred twenty-two million, one hundred one thousand, five hundred fifty-five".