1211220211000 has 64 divisors (see below), whose sum is σ = 2834444340000. Its totient is φ = 484455769600.

The previous prime is 1211220210973. The next prime is 1211220211007. The reversal of 1211220211000 is 1120221121.

It is a super-4 number, since 4×1211220211000⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220211007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19858551 + ... + 19919449.

Almost surely, 2^{1211220211000} is an apocalyptic number.

1211220211000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211220211000 is an abundant number, since it is smaller than the sum of its proper divisors (1623224129000).

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

1211220211000 is a wasteful number, since it uses less digits than its factorization.

1211220211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80809 (or 80795 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211220211000 its reverse (1120221121), we get a palindrome (1212340432121).

The spelling of 1211220211000 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred eleven thousand".