1221302112300 has 108 divisors (see below), whose sum is σ = 3832441452840. Its totient is φ = 325311517440.

The previous prime is 1221302112299. The next prime is 1221302112337. The reversal of 1221302112300 is 32112031221.

1221302112300 is a `hidden beast` number, since 1 + 22 + 130 + 211 + 2 + 300 = 666.

It is a super-2 number, since 2×1221302112300² (a number of 25 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26296 + ... + 1563104.

Almost surely, 2^{1221302112300} is an apocalyptic number.

1221302112300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221302112300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1916220726420).

1221302112300 is an abundant number, since it is smaller than the sum of its proper divisors (2611139340540).

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

1221302112300 is a wasteful number, since it uses less digits than its factorization.

1221302112300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537712 (or 1537702 counting only the distinct ones).

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

Adding to 1221302112300 its reverse (32112031221), we get a palindrome (1253414143521).

The spelling of 1221302112300 in words is "one trillion, two hundred twenty-one billion, three hundred two million, one hundred twelve thousand, three hundred".