121223100020 has 24 divisors (see below), whose sum is σ = 277711102368. Its totient is φ = 44081127200.

The previous prime is 121223100001. The next prime is 121223100029. The reversal of 121223100020 is 20001322121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121223099968 and 121223100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121223100029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275506826 + ... + 275507265.

It is an arithmetic number, because the mean of its divisors is an integer number (11571295932).

Almost surely, 2^121223100020 is an apocalyptic number.

121223100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121223100020 is an abundant number, since it is smaller than the sum of its proper divisors (156488002348).

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

121223100020 is a wasteful number, since it uses less digits than its factorization.

121223100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551014111 (or 551014109 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 121223100020 its reverse (20001322121), we get a palindrome (141224422141).

The spelling of 121223100020 in words is "one hundred twenty-one billion, two hundred twenty-three million, one hundred thousand, twenty".