1221021102110 has 16 divisors (see below), whose sum is σ = 2202732954000. Its totient is φ = 487320669696.

The previous prime is 1221021102029. The next prime is 1221021102137. The reversal of 1221021102110 is 112011201221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135966680 + ... + 135975659.

It is an arithmetic number, because the mean of its divisors is an integer number (137670809625).

Almost surely, 2^{1221021102110} is an apocalyptic number.

1221021102110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221021102110 is a deficient number, since it is larger than the sum of its proper divisors (981711851890).

1221021102110 is a wasteful number, since it uses less digits than its factorization.

1221021102110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271942795.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221021102110 its reverse (112011201221), we get a palindrome (1333032303331).

The spelling of 1221021102110 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred two thousand, one hundred ten".