121021200 has 90 divisors (see below), whose sum is σ = 419989674. Its totient is φ = 32271360.

The previous prime is 121021183. The next prime is 121021211. The reversal of 121021200 is 2120121.

It can be written as a sum of positive squares in 3 ways, for example, as 197136 + 120824064 = 444^2 + 10992^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a super-2 number, since 2×121021200² = 29292261698880000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13209 + ... + 20408.

Almost surely, 2^121021200 is an apocalyptic number.

121021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021200 is an abundant number, since it is smaller than the sum of its proper divisors (298968474).

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

121021200 is a wasteful number, since it uses less digits than its factorization.

121021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33641 (or 33627 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121021200 is about 11000.9635941585. The cubic root of 121021200 is about 494.6376288787.

Adding to 121021200 its reverse (2120121), we get a palindrome (123141321).

The spelling of 121021200 in words is "one hundred twenty-one million, twenty-one thousand, two hundred".