210121123310312 has 8 divisors (see below), whose sum is σ = 393977106206850. Its totient is φ = 105060561655152.

The previous prime is 210121123310311. The next prime is 210121123310327. The reversal of 210121123310312 is 213013321121012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 151237508153956 + 58883615156356 = 12297866^2 + 7673566^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×210121123310312² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (210121123310311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13132570206887 + ... + 13132570206902.

Almost surely, 2^{210121123310312} is an apocalyptic number.

It is an amenable number.

210121123310312 is a deficient number, since it is larger than the sum of its proper divisors (183855982896538).

210121123310312 is a wasteful number, since it uses less digits than its factorization.

210121123310312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26265140413795 (or 26265140413791 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 210121123310312 its reverse (213013321121012), we get a palindrome (423134444431324).

The spelling of 210121123310312 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred twenty-three million, three hundred ten thousand, three hundred twelve".