1211221220000 has 120 divisors (see below), whose sum is σ = 3250676100672. Its totient is φ = 440444000000.

The previous prime is 1211221219993. The next prime is 1211221220009. The reversal of 1211221220000 is 221221121.

It is not an unprimeable number, because it can be changed into a prime (1211221220009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2532776 + ... + 2972775.

Almost surely, 2^{1211221220000} is an apocalyptic number.

1211221220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211221220000 is an abundant number, since it is smaller than the sum of its proper divisors (2039454880672).

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

1211221220000 is an equidigital number, since it uses as much as digits as its factorization.

1211221220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505592 (or 5505569 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1211221220000 its reverse (221221121), we get a palindrome (1211442441121).

The spelling of 1211221220000 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand".