1210002121111 has 16 divisors (see below), whose sum is σ = 1415147846400. Its totient is φ = 1034155683960.

The previous prime is 1210002121067. The next prime is 1210002121169. The reversal of 1210002121111 is 1111212000121.

It is a happy number.

It is not a de Polignac number, because 1210002121111 - 2⁹ = 1210002120599 is a prime.

It is a super-2 number, since 2×1210002121111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210002121091 and 1210002121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210002131111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4964125 + ... + 5202166.

It is an arithmetic number, because the mean of its divisors is an integer number (88446740400).

Almost surely, 2^{1210002121111} is an apocalyptic number.

1210002121111 is a deficient number, since it is larger than the sum of its proper divisors (205145725289).

1210002121111 is an equidigital number, since it uses as much as digits as its factorization.

1210002121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10166659 (or 10166645 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210002121111 its reverse (1111212000121), we get a palindrome (2321214121232).

The spelling of 1210002121111 in words is "one trillion, two hundred ten billion, two million, one hundred twenty-one thousand, one hundred eleven".