1210000000121 has 24 divisors (see below), whose sum is σ = 1343595686664. Its totient is φ = 1088762400000.

The previous prime is 1210000000117. The next prime is 1210000000169.

1210000000121 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 282513510400 + 927486489721 = 531520^2 + 963061^2 .

It is not a de Polignac number, because 1210000000121 - 2² = 1210000000117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210000000099 and 1210000000108.

It is not an unprimeable number, because it can be changed into a prime (1210000000171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43260581 + ... + 43288541.

It is an arithmetic number, because the mean of its divisors is an integer number (55983153611).

Almost surely, 2^{1210000000121} is an apocalyptic number.

1210000000121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210000000121 is a deficient number, since it is larger than the sum of its proper divisors (133595686543).

1210000000121 is a wasteful number, since it uses less digits than its factorization.

1210000000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31625 (or 31614 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

It can be divided in two parts, 1210000000 and 121, that added together give a palindrome (1210000121).

The spelling of 1210000000121 in words is "one trillion, two hundred ten billion, one hundred twenty-one", and thus it is an aban number.