1300300021981 has 2 divisors, whose sum is σ = 1300300021982. Its totient is φ = 1300300021980.

The previous prime is 1300300021913. The next prime is 1300300022009. The reversal of 1300300021981 is 1891200030031.

It is an a-pointer prime, because the next prime (1300300022009) can be obtained adding 1300300021981 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1293601417956 + 6698604025 = 1137366^2 + 81845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1300300021981 - 2¹⁵ = 1300299989213 is a prime.

It is a super-2 number, since 2×1300300021981² (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 (1300300021381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650150010990 + 650150010991.

It is an arithmetic number, because the mean of its divisors is an integer number (650150010991).

Almost surely, 2^{1300300021981} is an apocalyptic number.

It is an amenable number.

1300300021981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1300300021981 is an equidigital number, since it uses as much as digits as its factorization.

1300300021981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 1300300021981 in words is "one trillion, three hundred billion, three hundred million, twenty-one thousand, nine hundred eighty-one".