1020120021247 has 2 divisors, whose sum is σ = 1020120021248. Its totient is φ = 1020120021246.

The previous prime is 1020120021199. The next prime is 1020120021281. The reversal of 1020120021247 is 7421200210201.

It is a strong prime.

It is an emirp because it is prime and its reverse (7421200210201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020120021247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020120021287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060010623 + 510060010624.

It is an arithmetic number, because the mean of its divisors is an integer number (510060010624).

Almost surely, 2^{1020120021247} is an apocalyptic number.

1020120021247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020120021247 is an equidigital number, since it uses as much as digits as its factorization.

1020120021247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 1020120021247 its reverse (7421200210201), we get a palindrome (8441320231448).

The spelling of 1020120021247 in words is "one trillion, twenty billion, one hundred twenty million, twenty-one thousand, two hundred forty-seven".