121226100 has 72 divisors (see below), whose sum is σ = 366018240. Its totient is φ = 30919680.

The previous prime is 121226087. The next prime is 121226101. The reversal of 121226100 is 1622121.

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 121226100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121226101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1885 + ... + 15684.

Almost surely, 2^121226100 is an apocalyptic number.

121226100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121226100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183009120).

121226100 is an abundant number, since it is smaller than the sum of its proper divisors (244792140).

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

121226100 is a wasteful number, since it uses less digits than its factorization.

121226100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17609 (or 17602 counting only the distinct ones).

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

The square root of 121226100 is about 11010.2724761924. The cubic root of 121226100 is about 494.9166271174.

Adding to 121226100 its reverse (1622121), we get a palindrome (122848221).

The spelling of 121226100 in words is "one hundred twenty-one million, two hundred twenty-six thousand, one hundred".