1221012101110 has 16 divisors (see below), whose sum is σ = 2224301564016. Its totient is φ = 482520444448.

The previous prime is 1221012101039. The next prime is 1221012101117. The reversal of 1221012101110 is 111012101221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012101117) 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, 735548629 + ... + 735550288.

It is an arithmetic number, because the mean of its divisors is an integer number (139018847751).

Almost surely, 2^{1221012101110} is an apocalyptic number.

1221012101110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221012101110 is a deficient number, since it is larger than the sum of its proper divisors (1003289462906).

1221012101110 is a wasteful number, since it uses less digits than its factorization.

1221012101110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471099007.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221012101110 its reverse (111012101221), we get a palindrome (1332024202331).

The spelling of 1221012101110 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred one thousand, one hundred ten".