1221010122066 has 32 divisors (see below), whose sum is σ = 2796564400128. Its totient is φ = 348149519760.

The previous prime is 1221010122047. The next prime is 1221010122067. The reversal of 1221010122066 is 6602210101221.

It is not an unprimeable number, because it can be changed into a prime (1221010122067) 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, 29583930 + ... + 29625173.

It is an arithmetic number, because the mean of its divisors is an integer number (87392637504).

Almost surely, 2^{1221010122066} is an apocalyptic number.

1221010122066 is an abundant number, since it is smaller than the sum of its proper divisors (1575554278062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221010122066 is a wasteful number, since it uses less digits than its factorization.

1221010122066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59209606.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 1221010122066 its reverse (6602210101221), we get a palindrome (7823220223287).

The spelling of 1221010122066 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred twenty-two thousand, sixty-six".