121223012100 has 72 divisors (see below), whose sum is σ = 352838958528. Its totient is φ = 32132553600.

The previous prime is 121223012077. The next prime is 121223012137. The reversal of 121223012100 is 1210322121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121223012100.

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, 1159711 + ... + 1259910.

Almost surely, 2^121223012100 is an apocalyptic number.

121223012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121223012100 is an abundant number, since it is smaller than the sum of its proper divisors (231615946428).

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

121223012100 is a wasteful number, since it uses less digits than its factorization.

121223012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419805 (or 2419798 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121223012100 its reverse (1210322121), we get a palindrome (122433334221).

The spelling of 121223012100 in words is "one hundred twenty-one billion, two hundred twenty-three million, twelve thousand, one hundred".