1222100121 has 48 divisors (see below), whose sum is σ = 1936692800. Its totient is φ = 682577280.

The previous prime is 1222100071. The next prime is 1222100137. The reversal of 1222100121 is 1210012221.

It is not a de Polignac number, because 1222100121 - 2¹⁰ = 1222099097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222100097 and 1222100106.

It is not an unprimeable number, because it can be changed into a prime (1222100141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 252795 + ... + 257583.

Almost surely, 2^1222100121 is an apocalyptic number.

1222100121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222100121 is a deficient number, since it is larger than the sum of its proper divisors (714592679).

1222100121 is a wasteful number, since it uses less digits than its factorization.

1222100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4870 (or 4859 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1222100121 is about 34958.5486111766. The cubic root of 1222100121 is about 1069.1425048255.

Adding to 1222100121 its reverse (1210012221), we get a palindrome (2432112342).

It can be divided in two parts, 1222100 and 121, that added together give a palindrome (1222221).

The spelling of 1222100121 in words is "one billion, two hundred twenty-two million, one hundred thousand, one hundred twenty-one".