2121111144 has 32 divisors (see below), whose sum is σ = 5891976000. Its totient is φ = 707036976.

The previous prime is 2121111133. The next prime is 2121111149. The reversal of 2121111144 is 4411111212.

It is a super-2 number, since 2×2121111144² = 8998224970401977472, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (2121111149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4909764 + ... + 4910195.

It is an arithmetic number, because the mean of its divisors is an integer number (184124250).

Almost surely, 2^2121111144 is an apocalyptic number.

2121111144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2121111144 is an abundant number, since it is smaller than the sum of its proper divisors (3770864856).

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

2121111144 is a wasteful number, since it uses less digits than its factorization.

2121111144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9819974 (or 9819964 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 2121111144 is about 46055.5224050276. The cubic root of 2121111144 is about 1284.8560541670.

Adding to 2121111144 its reverse (4411111212), we get a palindrome (6532222356).

The spelling of 2121111144 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, one hundred forty-four".