1221110210111 has 4 divisors (see below), whose sum is σ = 1332120229224. Its totient is φ = 1110100191000.

The previous prime is 1221110210077. The next prime is 1221110210129. The reversal of 1221110210111 is 1110120111221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221110210111 - 2¹⁴ = 1221110193727 is a prime.

It is a super-2 number, since 2×1221110210111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110210011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55505009540 + ... + 55505009561.

It is an arithmetic number, because the mean of its divisors is an integer number (333030057306).

Almost surely, 2^{1221110210111} is an apocalyptic number.

1221110210111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221110210111 is a deficient number, since it is larger than the sum of its proper divisors (111010019113).

1221110210111 is a wasteful number, since it uses less digits than its factorization.

1221110210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111010019112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1221110210111 its reverse (1110120111221), we get a palindrome (2331230321332).

The spelling of 1221110210111 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two hundred ten thousand, one hundred eleven".