1221102120020 has 24 divisors (see below), whose sum is σ = 2564338186368. Its totient is φ = 488436327200.

The previous prime is 1221102119981. The next prime is 1221102120083. The reversal of 1221102120020 is 200212011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221102119977 and 1221102120004.

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, 2700425 + ... + 3120015.

It is an arithmetic number, because the mean of its divisors is an integer number (106847424432).

Almost surely, 2^{1221102120020} is an apocalyptic number.

1221102120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221102120020 is an abundant number, since it is smaller than the sum of its proper divisors (1343236066348).

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

1221102120020 is a wasteful number, since it uses less digits than its factorization.

1221102120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565111 (or 565109 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221102120020 its reverse (200212011221), we get a palindrome (1421314131241).

The spelling of 1221102120020 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty thousand, twenty".