4042121212981 has 2 divisors, whose sum is σ = 4042121212982. Its totient is φ = 4042121212980.

The previous prime is 4042121212973. The next prime is 4042121213017. The reversal of 4042121212981 is 1892121212404.

4042121212981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3447579978756 + 594541234225 = 1856766^2 + 771065^2 .

It is a cyclic number.

It is not a de Polignac number, because 4042121212981 - 2³ = 4042121212973 is a prime.

It is a super-2 number, since 2×4042121212981² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4042121212981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4042121213981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021060606490 + 2021060606491.

It is an arithmetic number, because the mean of its divisors is an integer number (2021060606491).

Almost surely, 2^{4042121212981} is an apocalyptic number.

It is an amenable number.

4042121212981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042121212981 is an equidigital number, since it uses as much as digits as its factorization.

4042121212981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 37.

The spelling of 4042121212981 in words is "four trillion, forty-two billion, one hundred twenty-one million, two hundred twelve thousand, nine hundred eighty-one".