2112143981 has 8 divisors (see below), whose sum is σ = 2204436480. Its totient is φ = 2019889872.

The previous prime is 2112143959. The next prime is 2112143983. The reversal of 2112143981 is 1893412112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112143981 is a prime.

It is a super-2 number, since 2×2112143981² = 8922304392949056722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112143983) 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, 209975 + ... + 219803.

It is an arithmetic number, because the mean of its divisors is an integer number (275554560).

Almost surely, 2^2112143981 is an apocalyptic number.

It is an amenable number.

2112143981 is a deficient number, since it is larger than the sum of its proper divisors (92292499).

2112143981 is an equidigital number, since it uses as much as digits as its factorization.

2112143981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19195.

The product of its digits is 3456, while the sum is 32.

The square root of 2112143981 is about 45958.0676377935. The cubic root of 2112143981 is about 1283.0428868914.

The spelling of 2112143981 in words is "two billion, one hundred twelve million, one hundred forty-three thousand, nine hundred eighty-one".