1221002120211 has 8 divisors (see below), whose sum is σ = 1672002903504. Its totient is φ = 792001375200.

The previous prime is 1221002120201. The next prime is 1221002120213. The reversal of 1221002120211 is 1120212001221.

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

It is not a de Polignac number, because 1221002120211 - 2⁹ = 1221002119699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221002120213) 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, 5500009440 + ... + 5500009661.

It is an arithmetic number, because the mean of its divisors is an integer number (209000362938).

Almost surely, 2^{1221002120211} is an apocalyptic number.

1221002120211 is a deficient number, since it is larger than the sum of its proper divisors (451000783293).

1221002120211 is a wasteful number, since it uses less digits than its factorization.

1221002120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11000019141.

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

Adding to 1221002120211 its reverse (1120212001221), we get a palindrome (2341214121432).

The spelling of 1221002120211 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, two hundred eleven".