1212021122209 has 16 divisors (see below), whose sum is σ = 1233985999680. Its totient is φ = 1190252185920.

The previous prime is 1212021122173. The next prime is 1212021122281. The reversal of 1212021122209 is 9022211202121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1212021122209 - 2⁹ = 1212021121697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212021122509) 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, 9616602 + ... + 9741820.

It is an arithmetic number, because the mean of its divisors is an integer number (77124124980).

Almost surely, 2^{1212021122209} is an apocalyptic number.

It is an amenable number.

1212021122209 is a deficient number, since it is larger than the sum of its proper divisors (21964877471).

1212021122209 is a wasteful number, since it uses less digits than its factorization.

1212021122209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126000.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 1212021122209 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred twenty-two thousand, two hundred nine".