1221202001111 has 8 divisors (see below), whose sum is σ = 1242318137760. Its totient is φ = 1200250192768.

The previous prime is 1221202001087. The next prime is 1221202001153. The reversal of 1221202001111 is 1111002021221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221202001111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221202021111) 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, 41067086 + ... + 41096811.

It is an arithmetic number, because the mean of its divisors is an integer number (155289767220).

Almost surely, 2^{1221202001111} is an apocalyptic number.

1221202001111 is a deficient number, since it is larger than the sum of its proper divisors (21116136649).

1221202001111 is an equidigital number, since it uses as much as digits as its factorization.

1221202001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82164153.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221202001111 its reverse (1111002021221), we get a palindrome (2332204022332).

The spelling of 1221202001111 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one thousand, one hundred eleven".