121221120020 has 96 divisors (see below), whose sum is σ = 341792752896. Its totient is φ = 34876800000.

The previous prime is 121221120011. The next prime is 121221120029. The reversal of 121221120020 is 20021122121.

It is an interprime number because it is at equal distance from previous prime (121221120011) and next prime (121221120029).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 121221119977 and 121221120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221120029) 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, 3007481 + ... + 3047520.

It is an arithmetic number, because the mean of its divisors is an integer number (3560341176).

Almost surely, 2^121221120020 is an apocalyptic number.

121221120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221120020 is an abundant number, since it is smaller than the sum of its proper divisors (220571632876).

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

121221120020 is a wasteful number, since it uses less digits than its factorization.

121221120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055041 (or 6055039 counting only the distinct ones).

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

Adding to 121221120020 its reverse (20021122121), we get a palindrome (141242242141).

The spelling of 121221120020 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, twenty".