1211244421 has 8 divisors (see below), whose sum is σ = 1253460600. Its totient is φ = 1169058240.

The previous prime is 1211244409. The next prime is 1211244467. The reversal of 1211244421 is 1244421121.

It can be written as a sum of positive squares in 4 ways, for example, as 418202500 + 793041921 = 20450^2 + 28161^2 .

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 1211244421 - 2¹⁵ = 1211211653 is a prime.

It is a super-2 number, since 2×1211244421² = 2934226094807250482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211244392 and 1211244401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211244721) 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, 101931 + ... + 113191.

It is an arithmetic number, because the mean of its divisors is an integer number (156682575).

Almost surely, 2^1211244421 is an apocalyptic number.

It is an amenable number.

1211244421 is a deficient number, since it is larger than the sum of its proper divisors (42216179).

1211244421 is a wasteful number, since it uses less digits than its factorization.

1211244421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14999.

The product of its digits is 512, while the sum is 22.

The square root of 1211244421 is about 34802.9369594004. The cubic root of 1211244421 is about 1065.9674167851.

Adding to 1211244421 its reverse (1244421121), we get a palindrome (2455665542).

The spelling of 1211244421 in words is "one billion, two hundred eleven million, two hundred forty-four thousand, four hundred twenty-one".