10211220099961 has 2 divisors, whose sum is σ = 10211220099962. Its totient is φ = 10211220099960.

The previous prime is 10211220099937. The next prime is 10211220100189. The reversal of 10211220099961 is 16999002211201.

10211220099961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6253905609961 + 3957314490000 = 2500781^2 + 1989300^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211220099961 - 2⁵ = 10211220099929 is a prime.

It is not a weakly prime, because it can be changed into another prime (10211220099761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105610049980 + 5105610049981.

It is an arithmetic number, because the mean of its divisors is an integer number (5105610049981).

Almost surely, 2^{10211220099961} is an apocalyptic number.

It is an amenable number.

10211220099961 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211220099961 is an equidigital number, since it uses as much as digits as its factorization.

10211220099961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The spelling of 10211220099961 in words is "ten trillion, two hundred eleven billion, two hundred twenty million, ninety-nine thousand, nine hundred sixty-one".