100210000019861 has 2 divisors, whose sum is σ = 100210000019862. Its totient is φ = 100210000019860.

The previous prime is 100210000019839. The next prime is 100210000020023. The reversal of 100210000019861 is 168910000012001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82304703973636 + 17905296046225 = 9072194^2 + 4231465^2 .

It is a cyclic number.

It is not a de Polignac number, because 100210000019861 - 2³⁰ = 100208926278037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100210000019161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50105000009930 + 50105000009931.

It is an arithmetic number, because the mean of its divisors is an integer number (50105000009931).

Almost surely, 2^{100210000019861} is an apocalyptic number.

It is an amenable number.

100210000019861 is a deficient number, since it is larger than the sum of its proper divisors (1).

100210000019861 is an equidigital number, since it uses as much as digits as its factorization.

100210000019861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 29.

The spelling of 100210000019861 in words is "one hundred trillion, two hundred ten billion, nineteen thousand, eight hundred sixty-one".