121102100220 has 96 divisors (see below), whose sum is σ = 344564716608. Its totient is φ = 31775956992.

The previous prime is 121102100219. The next prime is 121102100227. The reversal of 121102100220 is 22001201121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121102100196 and 121102100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102100227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 946722 + ... + 1066998.

It is an arithmetic number, because the mean of its divisors is an integer number (3589215798).

Almost surely, 2^121102100220 is an apocalyptic number.

121102100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121102100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172282358304).

121102100220 is an abundant number, since it is smaller than the sum of its proper divisors (223462616388).

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

121102100220 is a wasteful number, since it uses less digits than its factorization.

121102100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120559 (or 120557 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121102100220 its reverse (22001201121), we get a palindrome (143103301341).

The spelling of 121102100220 in words is "one hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred twenty".