1221011121102 has 8 divisors (see below), whose sum is σ = 2442022242216. Its totient is φ = 407003707032.

The previous prime is 1221011121101. The next prime is 1221011121179. The reversal of 1221011121102 is 2011211101221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1221011121102 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011121101) 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, 101750926753 + ... + 101750926764.

It is an arithmetic number, because the mean of its divisors is an integer number (305252780277).

Almost surely, 2^{1221011121102} is an apocalyptic number.

1221011121102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221011121102 is a wasteful number, since it uses less digits than its factorization.

1221011121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203501853522.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221011121102 its reverse (2011211101221), we get a palindrome (3232222222323).

The spelling of 1221011121102 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred two".