1213124421 has 8 divisors (see below), whose sum is σ = 1633203520. Its totient is φ = 800897472.

The previous prime is 1213124387. The next prime is 1213124449. The reversal of 1213124421 is 1244213121.

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

It is not a de Polignac number, because 1213124421 - 2¹⁰ = 1213123397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213124021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962676 + ... + 1963293.

It is an arithmetic number, because the mean of its divisors is an integer number (204150440).

Almost surely, 2^1213124421 is an apocalyptic number.

It is an amenable number.

1213124421 is a deficient number, since it is larger than the sum of its proper divisors (420079099).

1213124421 is a wasteful number, since it uses less digits than its factorization.

1213124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926075.

The product of its digits is 384, while the sum is 21.

The square root of 1213124421 is about 34829.9357019217. The cubic root of 1213124421 is about 1066.5186357833.

Adding to 1213124421 its reverse (1244213121), we get a palindrome (2457337542).

The spelling of 1213124421 in words is "one billion, two hundred thirteen million, one hundred twenty-four thousand, four hundred twenty-one".