1211223100208 has 40 divisors (see below), whose sum is σ = 2560218278400. Its totient is φ = 550527333440.

The previous prime is 1211223100201. The next prime is 1211223100259. The reversal of 1211223100208 is 8020013221121.

It is a super-2 number, since 2×1211223100208² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211223100201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421541 + ... + 3758907.

It is an arithmetic number, because the mean of its divisors is an integer number (64005456960).

Almost surely, 2^{1211223100208} is an apocalyptic number.

It is an amenable number.

1211223100208 is an abundant number, since it is smaller than the sum of its proper divisors (1348995178192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211223100208 is a wasteful number, since it uses less digits than its factorization.

1211223100208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357785 (or 357779 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 1211223100208 its reverse (8020013221121), we get a palindrome (9231236321329).

The spelling of 1211223100208 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, one hundred thousand, two hundred eight".