1211222100008 has 16 divisors (see below), whose sum is σ = 2404632110580. Its totient is φ = 569986870528.

The previous prime is 1211222100007. The next prime is 1211222100029. The reversal of 1211222100008 is 8000012221121.

It can be written as a sum of positive squares in 2 ways, for example, as 1200159688324 + 11062411684 = 1095518^2 + 105178^2 .

It is not an unprimeable number, because it can be changed into a prime (1211222100007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4453022291 + ... + 4453022562.

Almost surely, 2^{1211222100008} is an apocalyptic number.

It is an amenable number.

1211222100008 is a deficient number, since it is larger than the sum of its proper divisors (1193410010572).

1211222100008 is a wasteful number, since it uses less digits than its factorization.

1211222100008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8906044876 (or 8906044872 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 1211222100008 its reverse (8000012221121), we get a palindrome (9211234321129).

The spelling of 1211222100008 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thousand, eight".