11211212121102 has 48 divisors (see below), whose sum is σ = 28073019143520. Its totient is φ = 3167212409856.

The previous prime is 11211212121097. The next prime is 11211212121163. The reversal of 11211212121102 is 20112121211211.

It is a happy number.

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

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, 499864483 + ... + 499886910.

It is an arithmetic number, because the mean of its divisors is an integer number (584854565490).

Almost surely, 2^{11211212121102} is an apocalyptic number.

11211212121102 is an abundant number, since it is smaller than the sum of its proper divisors (16861807022418).

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

11211212121102 is a wasteful number, since it uses less digits than its factorization.

11211212121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999751497 (or 999751494 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11211212121102 its reverse (20112121211211), we get a palindrome (31323333332313).

The spelling of 11211212121102 in words is "eleven trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred two".