121400210 has 48 divisors (see below), whose sum is σ = 233281944. Its totient is φ = 45467136.

The previous prime is 121400207. The next prime is 121400231. The reversal of 121400210 is 12004121.

It can be written as a sum of positive squares in 4 ways, for example, as 85914361 + 35485849 = 9269^2 + 5957^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121400191 and 121400200.

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, 280154 + ... + 280586.

Almost surely, 2^121400210 is an apocalyptic number.

121400210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121400210 is a deficient number, since it is larger than the sum of its proper divisors (111881734).

121400210 is a wasteful number, since it uses less digits than its factorization.

121400210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121400210 is about 11018.1763463833. The cubic root of 121400210 is about 495.1534537666.

Adding to 121400210 its reverse (12004121), we get a palindrome (133404331).

The spelling of 121400210 in words is "one hundred twenty-one million, four hundred thousand, two hundred ten".