121211220009 has 16 divisors (see below), whose sum is σ = 176384228544. Its totient is φ = 73429262400.

The previous prime is 121211220007. The next prime is 121211220017. The reversal of 121211220009 is 900022112121.

It is not a de Polignac number, because 121211220009 - 2¹ = 121211220007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121211220007) 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, 725262 + ... + 876599.

It is an arithmetic number, because the mean of its divisors is an integer number (11024014284).

Almost surely, 2^121211220009 is an apocalyptic number.

It is an amenable number.

121211220009 is a deficient number, since it is larger than the sum of its proper divisors (55173008535).

121211220009 is a wasteful number, since it uses less digits than its factorization.

121211220009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604168.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121211220009 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, nine".