111221202121000 has 128 divisors (see below), whose sum is σ = 263120641056000. Its totient is φ = 44000033760000.

The previous prime is 111221202120961. The next prime is 111221202121039. The reversal of 111221202121000 is 121202122111.

It is an interprime number because it is at equal distance from previous prime (111221202120961) and next prime (111221202121039).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92219871 + ... + 93418129.

It is an arithmetic number, because the mean of its divisors is an integer number (2055630008250).

Almost surely, 2^{111221202121000} is an apocalyptic number.

111221202121000 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 111221202121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131560320528000).

111221202121000 is an abundant number, since it is smaller than the sum of its proper divisors (151899438935000).

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

111221202121000 is a wasteful number, since it uses less digits than its factorization.

111221202121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199300 (or 1199286 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111221202121000 its reverse (121202122111), we get a palindrome (111342404243111).

The spelling of 111221202121000 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-one thousand".