121200120010 has 16 divisors (see below), whose sum is σ = 218184508872. Its totient is φ = 48474649600.

The previous prime is 121200119941. The next prime is 121200120011. The reversal of 121200120010 is 10021002121.

It can be written as a sum of positive squares in 4 ways, for example, as 115245991441 + 5954128569 = 339479^2 + 77163^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121200120011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579871 + ... + 760690.

Almost surely, 2^121200120010 is an apocalyptic number.

121200120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121200120010 is a deficient number, since it is larger than the sum of its proper divisors (96984388862).

121200120010 is a wasteful number, since it uses less digits than its factorization.

121200120010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349609.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121200120010 its reverse (10021002121), we get a palindrome (131221122131).

The spelling of 121200120010 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty thousand, ten".