1211222221010 has 16 divisors (see below), whose sum is σ = 2188683270936. Its totient is φ = 482603716608.

The previous prime is 1211222220973. The next prime is 1211222221039. The reversal of 1211222221010 is 101222221121.

It can be written as a sum of positive squares in 4 ways, for example, as 1145398674289 + 65823546721 = 1070233^2 + 256561^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211222221010.

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, 235643777 + ... + 235648916.

Almost surely, 2^{1211222221010} is an apocalyptic number.

1211222221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211222221010 is a deficient number, since it is larger than the sum of its proper divisors (977461049926).

1211222221010 is a wasteful number, since it uses less digits than its factorization.

1211222221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471292957.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211222221010 its reverse (101222221121), we get a palindrome (1312444442131).

The spelling of 1211222221010 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, ten".