1211421 has 16 divisors (see below), whose sum is σ = 1736640. Its totient is φ = 748800.

The previous prime is 1211411. The next prime is 1211423. The reversal of 1211421 is 1241121.

It is a happy number.

It is not a de Polignac number, because 1211421 - 2⁵ = 1211389 is a prime.

It is a super-3 number, since 3×1211421³ = 5333429373042514383, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211397 and 1211406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2821 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (108540).

2^1211421 is an apocalyptic number.

It is an amenable number.

1211421 is a deficient number, since it is larger than the sum of its proper divisors (525219).

1211421 is a wasteful number, since it uses less digits than its factorization.

1211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476.

The product of its digits is 16, while the sum is 12.

The square root of 1211421 is about 1100.6457195665. The cubic root of 1211421 is about 106.6019214289.

Adding to 1211421 its reverse (1241121), we get a palindrome (2452542).

The spelling of 1211421 in words is "one million, two hundred eleven thousand, four hundred twenty-one".