121210010109 has 24 divisors (see below), whose sum is σ = 184188232800. Its totient is φ = 76697849760.

The previous prime is 121210010099. The next prime is 121210010147. The reversal of 121210010109 is 901010012121.

It is a happy number.

It is not a de Polignac number, because 121210010109 - 2²⁸ = 120941574653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210010091 and 121210010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210010609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3920247 + ... + 3951044.

It is an arithmetic number, because the mean of its divisors is an integer number (7674509700).

Almost surely, 2^121210010109 is an apocalyptic number.

It is an amenable number.

121210010109 is a deficient number, since it is larger than the sum of its proper divisors (62978222691).

121210010109 is a wasteful number, since it uses less digits than its factorization.

121210010109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7871385 (or 7871382 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 121210010109 in words is "one hundred twenty-one billion, two hundred ten million, ten thousand, one hundred nine".