1211412421 has 4 divisors (see below), whose sum is σ = 1212011500. Its totient is φ = 1210813344.

The previous prime is 1211412409. The next prime is 1211412427. The reversal of 1211412421 is 1242141121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1182672100 + 28740321 = 34390^2 + 5361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211412421 - 2¹¹ = 1211410373 is a prime.

It is a super-3 number, since 3×1211412421³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211412427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296496 + ... + 300553.

It is an arithmetic number, because the mean of its divisors is an integer number (303002875).

Almost surely, 2^1211412421 is an apocalyptic number.

It is an amenable number.

1211412421 is a deficient number, since it is larger than the sum of its proper divisors (599079).

1211412421 is an equidigital number, since it uses as much as digits as its factorization.

1211412421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599078.

The product of its digits is 128, while the sum is 19.

The square root of 1211412421 is about 34805.3504651225. The cubic root of 1211412421 is about 1066.0166978507.

Adding to 1211412421 its reverse (1242141121), we get a palindrome (2453553542).

The spelling of 1211412421 in words is "one billion, two hundred eleven million, four hundred twelve thousand, four hundred twenty-one".