121223221020 has 72 divisors (see below), whose sum is σ = 401138665200. Its totient is φ = 29387447040.

The previous prime is 121223220991. The next prime is 121223221073. The reversal of 121223221020 is 20122322121.

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

It is a junction number, because it is equal to n+sod(n) for n = 121223220984 and 121223221002.

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, 30609945 + ... + 30613904.

It is an arithmetic number, because the mean of its divisors is an integer number (5571370350).

Almost surely, 2^121223221020 is an apocalyptic number.

121223221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121223221020 is an abundant number, since it is smaller than the sum of its proper divisors (279915444180).

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

121223221020 is a wasteful number, since it uses less digits than its factorization.

121223221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61223875 (or 61223870 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 121223221020 its reverse (20122322121), we get a palindrome (141345543141).

It can be divided in two parts, 121223 and 221020, that added together give a palindrome (342243).

The spelling of 121223221020 in words is "one hundred twenty-one billion, two hundred twenty-three million, two hundred twenty-one thousand, twenty".