1211021122009 has 4 divisors (see below), whose sum is σ = 1211035499280. Its totient is φ = 1211006744740.

The previous prime is 1211021121923. The next prime is 1211021122027. The reversal of 1211021122009 is 9002211201121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211021122009 - 2¹¹ = 1211021119961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211021122079) 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, 7061539 + ... + 7231000.

It is an arithmetic number, because the mean of its divisors is an integer number (302758874820).

Almost surely, 2^{1211021122009} is an apocalyptic number.

It is an amenable number.

1211021122009 is a deficient number, since it is larger than the sum of its proper divisors (14377271).

1211021122009 is an equidigital number, since it uses as much as digits as its factorization.

1211021122009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14377270.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1211021122009 in words is "one trillion, two hundred eleven billion, twenty-one million, one hundred twenty-two thousand, nine".