1221202120000 has 70 divisors (see below), whose sum is σ = 3028184466098. Its totient is φ = 488480832000.

The previous prime is 1221202119997. The next prime is 1221202120009. The reversal of 1221202120000 is 212021221.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 780975177984 + 440226942016 = 883728^2 + 663496^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221202120009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15225027 + ... + 15305026.

Almost surely, 2^{1221202120000} is an apocalyptic number.

1221202120000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221202120000 is an abundant number, since it is smaller than the sum of its proper divisors (1806982346098).

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

1221202120000 is an frugal number, since it uses more digits than its factorization.

1221202120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30530085 (or 30530060 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221202120000 its reverse (212021221), we get a palindrome (1221414141221).

The spelling of 1221202120000 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty thousand".