121111221111000 has 128 divisors (see below), whose sum is σ = 380585478873600. Its totient is φ = 32063977852800.

The previous prime is 121111221110987. The next prime is 121111221111029. The reversal of 121111221111000 is 111122111121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144800292 + ... + 145634291.

It is an arithmetic number, because the mean of its divisors is an integer number (2973324053700).

Almost surely, 2^{121111221111000} is an apocalyptic number.

121111221111000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111221111000 is an abundant number, since it is smaller than the sum of its proper divisors (259474257762600).

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

121111221111000 is a wasteful number, since it uses less digits than its factorization.

121111221111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290434746 (or 290434732 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 121111221111000 its reverse (111122111121), we get a palindrome (121222343222121).

It can be divided in two parts, 1211 and 11221111000, that added together give a palindrome (11221112211).

The spelling of 121111221111000 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand".