121220111221609 has 8 divisors (see below), whose sum is σ = 125130944327168. Its totient is φ = 117309309799680.

The previous prime is 121220111221607. The next prime is 121220111221633. The reversal of 121220111221609 is 906122111022121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121220111221609 - 2¹ = 121220111221607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220111221607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20472 + ... + 15570505.

It is an arithmetic number, because the mean of its divisors is an integer number (15641368040896).

Almost surely, 2^{121220111221609} is an apocalyptic number.

It is an amenable number.

121220111221609 is a deficient number, since it is larger than the sum of its proper divisors (3910833105559).

121220111221609 is a wasteful number, since it uses less digits than its factorization.

121220111221609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15841815.

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 121220111221609 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, six hundred nine".