2144199981 has 24 divisors (see below), whose sum is σ = 3591391552. Its totient is φ = 1113868800.

The previous prime is 2144199923. The next prime is 2144199991. The reversal of 2144199981 is 1899914412.

It is not a de Polignac number, because 2144199981 - 2⁶ = 2144199917 is a prime.

It is a super-2 number, since 2×2144199981² = 9195187117040800722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2144199981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2144199901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419380 + ... + 424461.

Almost surely, 2^2144199981 is an apocalyptic number.

2144199981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2144199981 is a deficient number, since it is larger than the sum of its proper divisors (1447191571).

2144199981 is a wasteful number, since it uses less digits than its factorization.

2144199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843873 (or 843862 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 2144199981 is about 46305.5070267026. The cubic root of 2144199981 is about 1289.5012355828.

The spelling of 2144199981 in words is "two billion, one hundred forty-four million, one hundred ninety-nine thousand, nine hundred eighty-one".