1211343204420 has 36 divisors (see below), whose sum is σ = 3674407720620. Its totient is φ = 323024854464.

The previous prime is 1211343204413. The next prime is 1211343204431. The reversal of 1211343204420 is 244023431121.

1211343204420 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 34 + 3 + 204 + 420 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 268471132164 + 942872072256 = 518142^2 + 971016^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3364842055 + ... + 3364842414.

Almost surely, 2^{1211343204420} is an apocalyptic number.

1211343204420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211343204420 is an abundant number, since it is smaller than the sum of its proper divisors (2463064516200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211343204420 is a wasteful number, since it uses less digits than its factorization.

1211343204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6729684484 (or 6729684479 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1211343204420 its reverse (244023431121), we get a palindrome (1455366635541).

The spelling of 1211343204420 in words is "one trillion, two hundred eleven billion, three hundred forty-three million, two hundred four thousand, four hundred twenty".