1221010110111 has 32 divisors (see below), whose sum is σ = 1831760925696. Its totient is φ = 717090320000.

The previous prime is 1221010110101. The next prime is 1221010110181. The reversal of 1221010110111 is 1110110101221.

It is a cyclic number.

It is not a de Polignac number, because 1221010110111 - 2⁵ = 1221010110079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010110101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3740580 + ... + 4053881.

It is an arithmetic number, because the mean of its divisors is an integer number (57242528928).

Almost surely, 2^{1221010110111} is an apocalyptic number.

1221010110111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221010110111 is a deficient number, since it is larger than the sum of its proper divisors (610750815585).

1221010110111 is a wasteful number, since it uses less digits than its factorization.

1221010110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7794623.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1221010110111 its reverse (1110110101221), we get a palindrome (2331120211332).

The spelling of 1221010110111 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred ten thousand, one hundred eleven".