1211221101300 has 72 divisors (see below), whose sum is σ = 4005104448576. Its totient is φ = 276850536960.

The previous prime is 1211221101287. The next prime is 1211221101341. The reversal of 1211221101300 is 31011221121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1211221101300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288383877 + ... + 288388076.

Almost surely, 2^{1211221101300} is an apocalyptic number.

1211221101300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211221101300 is an abundant number, since it is smaller than the sum of its proper divisors (2793883347276).

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

1211221101300 is a wasteful number, since it uses less digits than its factorization.

1211221101300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576771977 (or 576771970 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1211221101300 its reverse (31011221121), we get a palindrome (1242232322421).

The spelling of 1211221101300 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred one thousand, three hundred".