1421018125981 has 2 divisors, whose sum is σ = 1421018125982. Its totient is φ = 1421018125980.

The previous prime is 1421018125973. The next prime is 1421018126057. The reversal of 1421018125981 is 1895218101241.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 930935522500 + 490082603481 = 964850^2 + 700059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421018125981 - 2³ = 1421018125973 is a prime.

It is a super-2 number, since 2×1421018125981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421018125951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710509062990 + 710509062991.

It is an arithmetic number, because the mean of its divisors is an integer number (710509062991).

Almost surely, 2^{1421018125981} is an apocalyptic number.

It is an amenable number.

1421018125981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421018125981 is an equidigital number, since it uses as much as digits as its factorization.

1421018125981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 43.

The spelling of 1421018125981 in words is "one trillion, four hundred twenty-one billion, eighteen million, one hundred twenty-five thousand, nine hundred eighty-one".