1212001021205 has 8 divisors (see below), whose sum is σ = 1566278242872. Its totient is φ = 895016138688.

The previous prime is 1212001021163. The next prime is 1212001021213. The reversal of 1212001021205 is 5021201002121.

It can be written as a sum of positive squares in 4 ways, for example, as 964599364 + 1211036421841 = 31058^2 + 1100471^2 .

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 1212001021205 - 2²⁴ = 1211984243989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9323084714 + ... + 9323084843.

It is an arithmetic number, because the mean of its divisors is an integer number (195784780359).

Almost surely, 2^{1212001021205} is an apocalyptic number.

It is an amenable number.

1212001021205 is a deficient number, since it is larger than the sum of its proper divisors (354277221667).

1212001021205 is a wasteful number, since it uses less digits than its factorization.

1212001021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18646169575.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 1212001021205 its reverse (5021201002121), we get a palindrome (6233202023326).

The spelling of 1212001021205 in words is "one trillion, two hundred twelve billion, one million, twenty-one thousand, two hundred five".