10212311109821 has 2 divisors, whose sum is σ = 10212311109822. Its totient is φ = 10212311109820.

The previous prime is 10212311109739. The next prime is 10212311109829. The reversal of 10212311109821 is 12890111321201.

10212311109821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7524383649721 + 2687927460100 = 2743061^2 + 1639490^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212311109821 - 2²⁶ = 10212244000957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212311109829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106155554910 + 5106155554911.

It is an arithmetic number, because the mean of its divisors is an integer number (5106155554911).

Almost surely, 2^{10212311109821} is an apocalyptic number.

It is an amenable number.

10212311109821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212311109821 is an equidigital number, since it uses as much as digits as its factorization.

10212311109821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 32.

The spelling of 10212311109821 in words is "ten trillion, two hundred twelve billion, three hundred eleven million, one hundred nine thousand, eight hundred twenty-one".