121213100 has 72 divisors (see below), whose sum is σ = 276398976. Its totient is φ = 46080000.

The previous prime is 121213063. The next prime is 121213129. The reversal of 121213100 is 1312121.

It is a super-2 number, since 2×121213100² = 29385231223220000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188780 + ... + 189420.

Almost surely, 2^121213100 is an apocalyptic number.

121213100 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 121213100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138199488).

121213100 is an abundant number, since it is smaller than the sum of its proper divisors (155185876).

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

121213100 is a wasteful number, since it uses less digits than its factorization.

121213100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 121213100 is about 11009.6821025859. The cubic root of 121213100 is about 494.8989352557.

Adding to 121213100 its reverse (1312121), we get a palindrome (122525221).

The spelling of 121213100 in words is "one hundred twenty-one million, two hundred thirteen thousand, one hundred".