121121100120 has 64 divisors (see below), whose sum is σ = 364375584000. Its totient is φ = 32208979328.

The previous prime is 121121100109. The next prime is 121121100127. The reversal of 121121100120 is 21001121121.

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 = 121121100096 and 121121100105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121100127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1362690 + ... + 1448849.

It is an arithmetic number, because the mean of its divisors is an integer number (5693368500).

Almost surely, 2^121121100120 is an apocalyptic number.

121121100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121100120 is an abundant number, since it is smaller than the sum of its proper divisors (243254483880).

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

121121100120 is a wasteful number, since it uses less digits than its factorization.

121121100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811912 (or 2811908 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121121100120 its reverse (21001121121), we get a palindrome (142122221241).

The spelling of 121121100120 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, one hundred twenty".