1212100010021 has 8 divisors (see below), whose sum is σ = 1214180640504. Its totient is φ = 1210020972480.

The previous prime is 1212100009961. The next prime is 1212100010161. The reversal of 1212100010021 is 1200100012121.

It can be written as a sum of positive squares in 4 ways, for example, as 11729973025 + 1200370036996 = 108305^2 + 1095614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212100010021 - 2¹⁰ = 1212100008997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212100009984 and 1212100010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212100010321) 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 7 ways as a sum of consecutive naturals, for example, 1129931 + ... + 1923783.

It is an arithmetic number, because the mean of its divisors is an integer number (151772580063).

Almost surely, 2^{1212100010021} is an apocalyptic number.

It is an amenable number.

1212100010021 is a deficient number, since it is larger than the sum of its proper divisors (2080630483).

1212100010021 is an equidigital number, since it uses as much as digits as its factorization.

1212100010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796471.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1212100010021 its reverse (1200100012121), we get a palindrome (2412200022142).

The spelling of 1212100010021 in words is "one trillion, two hundred twelve billion, one hundred million, ten thousand, twenty-one".