1220221121111 has 8 divisors (see below), whose sum is σ = 1311771866880. Its totient is φ = 1131403233528.

The previous prime is 1220221121099. The next prime is 1220221121117. The reversal of 1220221121111 is 1111211220221.

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

It is a de Polignac number, because none of the positive numbers 2^k-1220221121111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220221121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221121117) 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, 683213621 + ... + 683215406.

It is an arithmetic number, because the mean of its divisors is an integer number (163971483360).

Almost surely, 2^{1220221121111} is an apocalyptic number.

1220221121111 is a deficient number, since it is larger than the sum of its proper divisors (91550745769).

1220221121111 is a wasteful number, since it uses less digits than its factorization.

1220221121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366429093.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1220221121111 its reverse (1111211220221), we get a palindrome (2331432341332).

The spelling of 1220221121111 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".