2121220100009 has 16 divisors (see below), whose sum is σ = 2248378429440. Its totient is φ = 1998408116880.

The previous prime is 2121220099967. The next prime is 2121220100017. The reversal of 2121220100009 is 9000010221212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2121220100009 - 2⁸ = 2121220099753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121220100029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5441567 + ... + 5818340.

It is an arithmetic number, because the mean of its divisors is an integer number (140523651840).

Almost surely, 2^{2121220100009} is an apocalyptic number.

It is an amenable number.

2121220100009 is a deficient number, since it is larger than the sum of its proper divisors (127158329431).

2121220100009 is a wasteful number, since it uses less digits than its factorization.

2121220100009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11260100.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 2121220100009 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred thousand, nine".