10212001210921 has 2 divisors, whose sum is σ = 10212001210922. Its totient is φ = 10212001210920.

The previous prime is 10212001210919. The next prime is 10212001211033. The reversal of 10212001210921 is 12901210021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9696528905625 + 515472305296 = 3113925^2 + 717964^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212001210921 - 2¹ = 10212001210919 is a prime.

Together with 10212001210919, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 10212001210892 and 10212001210901.

It is not a weakly prime, because it can be changed into another prime (10212001240921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106000605460 + 5106000605461.

It is an arithmetic number, because the mean of its divisors is an integer number (5106000605461).

Almost surely, 2^{10212001210921} is an apocalyptic number.

It is an amenable number.

10212001210921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212001210921 is an equidigital number, since it uses as much as digits as its factorization.

10212001210921 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 22.

The spelling of 10212001210921 in words is "ten trillion, two hundred twelve billion, one million, two hundred ten thousand, nine hundred twenty-one".