4021981012 has 12 divisors (see below), whose sum is σ = 8043962080. Its totient is φ = 1723706136.

The previous prime is 4021980943. The next prime is 4021981027. The reversal of 4021981012 is 2101891204.

4021981012 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 143642179 = 4021981012 / (4 + 0 + 2 + 1 + 9 + 8 + 1 + 0 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71821062 + ... + 71821117.

Almost surely, 2^4021981012 is an apocalyptic number.

It is an amenable number.

4021981012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

4021981012 is a wasteful number, since it uses less digits than its factorization.

4021981012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143642190 (or 143642188 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 4021981012 is about 63419.0902804510. The cubic root of 4021981012 is about 1590.3034654084.

The spelling of 4021981012 in words is "four billion, twenty-one million, nine hundred eighty-one thousand, twelve".