1211344421 has 8 divisors (see below), whose sum is σ = 1386402624. Its totient is φ = 1036788480.

The previous prime is 1211344417. The next prime is 1211344451. The reversal of 1211344421 is 1244431121.

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

It is not a de Polignac number, because 1211344421 - 2² = 1211344417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211344451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120380 + ... + 130053.

It is an arithmetic number, because the mean of its divisors is an integer number (173300328).

Almost surely, 2^1211344421 is an apocalyptic number.

It is an amenable number.

1211344421 is a deficient number, since it is larger than the sum of its proper divisors (175058203).

1211344421 is an equidigital number, since it uses as much as digits as its factorization.

1211344421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251131.

The product of its digits is 768, while the sum is 23.

The square root of 1211344421 is about 34804.3735901108. The cubic root of 1211344421 is about 1065.9967513016.

Adding to 1211344421 its reverse (1244431121), we get a palindrome (2455775542).

The spelling of 1211344421 in words is "one billion, two hundred eleven million, three hundred forty-four thousand, four hundred twenty-one".