1221214111 has 6 divisors (see below), whose sum is σ = 1322379960. Its totient is φ = 1127274408.

The previous prime is 1221214073. The next prime is 1221214121. The reversal of 1221214111 is 1114121221.

It is not a de Polignac number, because 1221214111 - 2⁹ = 1221213599 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 (1221214121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3612891 + ... + 3613228.

It is an arithmetic number, because the mean of its divisors is an integer number (220396660).

Almost surely, 2^1221214111 is an apocalyptic number.

1221214111 is a deficient number, since it is larger than the sum of its proper divisors (101165849).

1221214111 is an equidigital number, since it uses as much as digits as its factorization.

1221214111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7226145 (or 7226132 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

The square root of 1221214111 is about 34945.8740196894. The cubic root of 1221214111 is about 1068.8840699266.

Adding to 1221214111 its reverse (1114121221), we get a palindrome (2335335332).

The spelling of 1221214111 in words is "one billion, two hundred twenty-one million, two hundred fourteen thousand, one hundred eleven".