1210122222221 has 12 divisors (see below), whose sum is σ = 1330266346332. Its totient is φ = 1100001936000.

The previous prime is 1210122222167. The next prime is 1210122222269. The reversal of 1210122222221 is 1222222210121.

It can be written as a sum of positive squares in 2 ways, for example, as 410546466121 + 799575756100 = 640739^2 + 894190^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1210122222221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210122222193 and 1210122222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210122221221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 740741 + ... + 1723061.

It is an arithmetic number, because the mean of its divisors is an integer number (110855528861).

Almost surely, 2^{1210122222221} is an apocalyptic number.

1210122222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210122222221 is a deficient number, since it is larger than the sum of its proper divisors (120144124111).

1210122222221 is a wasteful number, since it uses less digits than its factorization.

1210122222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992524 (or 992513 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1210122222221 its reverse (1222222210121), we get a palindrome (2432344432342).

The spelling of 1210122222221 in words is "one trillion, two hundred ten billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".