1221020200011 has 8 divisors (see below), whose sum is σ = 1644146012304. Its totient is φ = 805953927200.

The previous prime is 1221020199989. The next prime is 1221020200079. The reversal of 1221020200011 is 1100020201221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221020200011 - 2¹⁰ = 1221020198987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221020200011.

It is not an unprimeable number, because it can be changed into a prime (1221020202011) 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, 2014884516 + ... + 2014885121.

It is an arithmetic number, because the mean of its divisors is an integer number (205518251538).

Almost surely, 2^{1221020200011} is an apocalyptic number.

1221020200011 is a deficient number, since it is larger than the sum of its proper divisors (423125812293).

1221020200011 is a wasteful number, since it uses less digits than its factorization.

1221020200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029769741.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221020200011 its reverse (1100020201221), we get a palindrome (2321040401232).

The spelling of 1221020200011 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, eleven".