1221010212112 has 10 divisors (see below), whose sum is σ = 2365707285998. Its totient is φ = 610505106048.

The previous prime is 1221010212083. The next prime is 1221010212127. The reversal of 1221010212112 is 2112120101221.

It can be written as a sum of positive squares in only one way, i.e., 834146115856 + 386864096256 = 913316^2 + 621984^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 76313138257 = 1221010212112 / (1 + 2 + 2 + 1 + 0 + 1 + 0 + 2 + 1 + 2 + 1 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38156569113 + ... + 38156569144.

Almost surely, 2^{1221010212112} is an apocalyptic number.

It is an amenable number.

1221010212112 is a deficient number, since it is larger than the sum of its proper divisors (1144697073886).

1221010212112 is an equidigital number, since it uses as much as digits as its factorization.

1221010212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76313138265 (or 76313138259 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221010212112 its reverse (2112120101221), we get a palindrome (3333130313333).

The spelling of 1221010212112 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred twelve thousand, one hundred twelve".