1221203211300 has 108 divisors (see below), whose sum is σ = 3849920086740. Its totient is φ = 323771754240.

The previous prime is 1221203211299. The next prime is 1221203211307. The reversal of 1221203211300 is 31123021221.

1221203211300 is a `hidden beast` number, since 1 + 2 + 21 + 20 + 321 + 1 + 300 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 154581076224 + 1066622135076 = 393168^2 + 1032774^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1221203211307) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3765955 + ... + 4077354.

Almost surely, 2^{1221203211300} is an apocalyptic number.

1221203211300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221203211300 is an abundant number, since it is smaller than the sum of its proper divisors (2628716875440).

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

1221203211300 is a wasteful number, since it uses less digits than its factorization.

1221203211300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843502 (or 7843492 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221203211300 its reverse (31123021221), we get a palindrome (1252326232521).

The spelling of 1221203211300 in words is "one trillion, two hundred twenty-one billion, two hundred three million, two hundred eleven thousand, three hundred".