1221001010122 has 24 divisors (see below), whose sum is σ = 1908036919116. Its totient is φ = 585846048000.

The previous prime is 1221001010077. The next prime is 1221001010149. The reversal of 1221001010122 is 2210101001221.

It can be written as a sum of positive squares in 6 ways, for example, as 111836067561 + 1109164942561 = 334419^2 + 1053169^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2771779 + ... + 3181942.

Almost surely, 2^{1221001010122} is an apocalyptic number.

1221001010122 is a deficient number, since it is larger than the sum of its proper divisors (687035908994).

1221001010122 is an equidigital number, since it uses as much as digits as its factorization.

1221001010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5953866 (or 5953825 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221001010122 its reverse (2210101001221), we get a palindrome (3431102011343).

The spelling of 1221001010122 in words is "one trillion, two hundred twenty-one billion, one million, ten thousand, one hundred twenty-two".