1021212011009 has 4 divisors (see below), whose sum is σ = 1021471931460. Its totient is φ = 1020952090560.

The previous prime is 1021212010979. The next prime is 1021212011059. The reversal of 1021212011009 is 9001102121201.

1021212011009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117904330384 + 903307680625 = 343372^2 + 950425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021212011009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021212011059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129954332 + ... + 129962189.

It is an arithmetic number, because the mean of its divisors is an integer number (255367982865).

Almost surely, 2^{1021212011009} is an apocalyptic number.

It is an amenable number.

1021212011009 is a deficient number, since it is larger than the sum of its proper divisors (259920451).

1021212011009 is an equidigital number, since it uses as much as digits as its factorization.

1021212011009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259920450.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1021212011009 in words is "one trillion, twenty-one billion, two hundred twelve million, eleven thousand, nine".