1221122121102 has 112 divisors (see below), whose sum is σ = 3131492479920. Its totient is φ = 353628032256.

The previous prime is 1221122121101. The next prime is 1221122121133. The reversal of 1221122121102 is 2011212211221.

It is a super-2 number, since 2×1221122121102² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1572652 + ... + 2217087.

It is an arithmetic number, because the mean of its divisors is an integer number (27959754285).

Almost surely, 2^{1221122121102} is an apocalyptic number.

1221122121102 is an abundant number, since it is smaller than the sum of its proper divisors (1910370358818).

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

1221122121102 is a wasteful number, since it uses less digits than its factorization.

1221122121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789789 (or 3789774 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221122121102 its reverse (2011212211221), we get a palindrome (3232334332323).

The spelling of 1221122121102 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred two".