1020000021247 has 2 divisors, whose sum is σ = 1020000021248. Its totient is φ = 1020000021246.

The previous prime is 1020000021169. The next prime is 1020000021319. The reversal of 1020000021247 is 7421200000201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020000021247 - 2¹⁵ = 1019999988479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020000021647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510000010623 + 510000010624.

It is an arithmetic number, because the mean of its divisors is an integer number (510000010624).

Almost surely, 2^{1020000021247} is an apocalyptic number.

1020000021247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020000021247 is an equidigital number, since it uses as much as digits as its factorization.

1020000021247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 1020000021247 its reverse (7421200000201), we get a palindrome (8441200021448).

The spelling of 1020000021247 in words is "one trillion, twenty billion, twenty-one thousand, two hundred forty-seven".