1231221404 has 12 divisors (see below), whose sum is σ = 2462442864. Its totient is φ = 527666304.

The previous prime is 1231221401. The next prime is 1231221421. The reversal of 1231221404 is 4041221321.

1231221404 is an admirable number.

It is a super-2 number, since 2×1231221404² = 3031812291335462432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221401) 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, 21986069 + ... + 21986124.

It is an arithmetic number, because the mean of its divisors is an integer number (205203572).

Almost surely, 2^1231221404 is an apocalyptic number.

1231221404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1231221404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231221404 is a wasteful number, since it uses less digits than its factorization.

1231221404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43972204 (or 43972202 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1231221404 is about 35088.7646405513. The cubic root of 1231221404 is about 1071.7958034900.

Adding to 1231221404 its reverse (4041221321), we get a palindrome (5272442725).

The spelling of 1231221404 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred four".