1020013210621 has 2 divisors, whose sum is σ = 1020013210622. Its totient is φ = 1020013210620.

The previous prime is 1020013210589. The next prime is 1020013210661. The reversal of 1020013210621 is 1260123100201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998700422500 + 21312788121 = 999350^2 + 145989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020013210621 - 2⁵ = 1020013210589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020013210661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510006605310 + 510006605311.

It is an arithmetic number, because the mean of its divisors is an integer number (510006605311).

Almost surely, 2^{1020013210621} is an apocalyptic number.

It is an amenable number.

1020013210621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020013210621 is an equidigital number, since it uses as much as digits as its factorization.

1020013210621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1020013210621 its reverse (1260123100201), we get a palindrome (2280136310822).

The spelling of 1020013210621 in words is "one trillion, twenty billion, thirteen million, two hundred ten thousand, six hundred twenty-one".