1220121222102 has 48 divisors (see below), whose sum is σ = 2766271856400. Its totient is φ = 388248659136.

The previous prime is 1220121222091. The next prime is 1220121222127. The reversal of 1220121222102 is 2012221210221.

It is a happy number.

1220121222102 is a `hidden beast` number, since 1 + 220 + 121 + 222 + 102 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17247852 + ... + 17318447.

It is an arithmetic number, because the mean of its divisors is an integer number (57630663675).

Almost surely, 2^{1220121222102} is an apocalyptic number.

1220121222102 is an abundant number, since it is smaller than the sum of its proper divisors (1546150634298).

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

1220121222102 is a wasteful number, since it uses less digits than its factorization.

1220121222102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34566397 (or 34566394 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1220121222102 its reverse (2012221210221), we get a palindrome (3232342432323).

The spelling of 1220121222102 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred two".