1211102155700 has 144 divisors (see below), whose sum is σ = 2765410502400. Its totient is φ = 459714393600.

The previous prime is 1211102155691. The next prime is 1211102155721. The reversal of 1211102155700 is 75512011121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211102155700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413767637 + ... + 413770563.

It is an arithmetic number, because the mean of its divisors is an integer number (19204239600).

Almost surely, 2^{1211102155700} is an apocalyptic number.

1211102155700 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 1211102155700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382705251200).

1211102155700 is an abundant number, since it is smaller than the sum of its proper divisors (1554308346700).

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

1211102155700 is a wasteful number, since it uses less digits than its factorization.

1211102155700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370 (or 5363 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 26.

Adding to 1211102155700 its reverse (75512011121), we get a palindrome (1286614166821).

The spelling of 1211102155700 in words is "one trillion, two hundred eleven billion, one hundred two million, one hundred fifty-five thousand, seven hundred".