1213121404 has 12 divisors (see below), whose sum is σ = 2315959128. Its totient is φ = 551418800.

The previous prime is 1213121387. The next prime is 1213121423. The reversal of 1213121404 is 4041213121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13785427 + ... + 13785514.

It is an arithmetic number, because the mean of its divisors is an integer number (192996594).

Almost surely, 2^1213121404 is an apocalyptic number.

It is an amenable number.

1213121404 is a deficient number, since it is larger than the sum of its proper divisors (1102837724).

1213121404 is a wasteful number, since it uses less digits than its factorization.

1213121404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27570956 (or 27570954 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1213121404 is about 34829.8923914502. The cubic root of 1213121404 is about 1066.5177516505.

Adding to 1213121404 its reverse (4041213121), we get a palindrome (5254334525).

The spelling of 1213121404 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, four hundred four".