1020211219861 has 2 divisors, whose sum is σ = 1020211219862. Its totient is φ = 1020211219860.

The previous prime is 1020211219829. The next prime is 1020211219901. The reversal of 1020211219861 is 1689121120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831361004100 + 188850215761 = 911790^2 + 434569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020211219861 - 2⁵ = 1020211219829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020211214861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510105609930 + 510105609931.

It is an arithmetic number, because the mean of its divisors is an integer number (510105609931).

Almost surely, 2^{1020211219861} is an apocalyptic number.

It is an amenable number.

1020211219861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020211219861 is an equidigital number, since it uses as much as digits as its factorization.

1020211219861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 1020211219861 in words is "one trillion, twenty billion, two hundred eleven million, two hundred nineteen thousand, eight hundred sixty-one".