1211000100102 has 96 divisors (see below), whose sum is σ = 2992472683200. Its totient is φ = 350627696640.

The previous prime is 1211000100097. The next prime is 1211000100133. The reversal of 1211000100102 is 2010010001121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

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, 22213774 + ... + 22268222.

It is an arithmetic number, because the mean of its divisors is an integer number (31171590450).

Almost surely, 2^{1211000100102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211000100102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1496236341600).

1211000100102 is an abundant number, since it is smaller than the sum of its proper divisors (1781472583098).

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

1211000100102 is a wasteful number, since it uses less digits than its factorization.

1211000100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60078 (or 60075 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1211000100102 its reverse (2010010001121), we get a palindrome (3221010101223).

The spelling of 1211000100102 in words is "one trillion, two hundred eleven billion, one hundred thousand, one hundred two".