121211200009 has 4 divisors (see below), whose sum is σ = 121212484816. Its totient is φ = 121209915204.

The previous prime is 121211199983. The next prime is 121211200039. The reversal of 121211200009 is 900002112121.

It is a happy number.

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 121211200009 - 2¹³ = 121211191817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211200039) 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, 488619 + ... + 693664.

It is an arithmetic number, because the mean of its divisors is an integer number (30303121204).

Almost surely, 2^121211200009 is an apocalyptic number.

It is an amenable number.

121211200009 is a deficient number, since it is larger than the sum of its proper divisors (1284807).

121211200009 is a wasteful number, since it uses less digits than its factorization.

121211200009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284806.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 121211200009 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thousand, nine".