1221202102011 has 8 divisors (see below), whose sum is σ = 1628322504720. Its totient is φ = 814108216992.

The previous prime is 1221202101997. The next prime is 1221202102013. The reversal of 1221202102011 is 1102012021221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221202102011 - 2⁹ = 1221202101499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221202102013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6521716 + ... + 6706353.

It is an arithmetic number, because the mean of its divisors is an integer number (203540313090).

Almost surely, 2^{1221202102011} is an apocalyptic number.

1221202102011 is a deficient number, since it is larger than the sum of its proper divisors (407120402709).

1221202102011 is a wasteful number, since it uses less digits than its factorization.

1221202102011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13258845.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221202102011 its reverse (1102012021221), we get a palindrome (2323214123232).

The spelling of 1221202102011 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred two thousand, eleven".