121012400210 has 64 divisors (see below), whose sum is σ = 237664355040. Its totient is φ = 44095518720.

The previous prime is 121012400161. The next prime is 121012400219. The reversal of 121012400210 is 12004210121.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 3834210241 + 117178189969 = 61921^2 + 342313^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121012400219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6249704 + ... + 6269036.

Almost surely, 2^121012400210 is an apocalyptic number.

121012400210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121012400210 is a deficient number, since it is larger than the sum of its proper divisors (116651954830).

121012400210 is a wasteful number, since it uses less digits than its factorization.

121012400210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19983.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121012400210 its reverse (12004210121), we get a palindrome (133016610331).

The spelling of 121012400210 in words is "one hundred twenty-one billion, twelve million, four hundred thousand, two hundred ten".