142120042013981 has 2 divisors, whose sum is σ = 142120042013982. Its totient is φ = 142120042013980.

The previous prime is 142120042013899. The next prime is 142120042014043. The reversal of 142120042013981 is 189310240021241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114464107464100 + 27655934549881 = 10698790^2 + 5258891^2 .

It is a cyclic number.

It is not a de Polignac number, because 142120042013981 - 2⁴² = 137721995502877 is a prime.

It is a super-2 number, since 2×142120042013981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142120042013381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71060021006990 + 71060021006991.

It is an arithmetic number, because the mean of its divisors is an integer number (71060021006991).

Almost surely, 2^{142120042013981} is an apocalyptic number.

It is an amenable number.

142120042013981 is a deficient number, since it is larger than the sum of its proper divisors (1).

142120042013981 is an equidigital number, since it uses as much as digits as its factorization.

142120042013981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 142120042013981 in words is "one hundred forty-two trillion, one hundred twenty billion, forty-two million, thirteen thousand, nine hundred eighty-one".