1321212404 has 12 divisors (see below), whose sum is σ = 2315028324. Its totient is φ = 659775744.

The previous prime is 1321212397. The next prime is 1321212407. The reversal of 1321212404 is 4042121231.

It can be written as a sum of positive squares in 2 ways, for example, as 523036900 + 798175504 = 22870^2 + 28252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321212407) 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, 204029 + ... + 210404.

It is an arithmetic number, because the mean of its divisors is an integer number (192919027).

Almost surely, 2^1321212404 is an apocalyptic number.

It is an amenable number.

1321212404 is a deficient number, since it is larger than the sum of its proper divisors (993815920).

1321212404 is a wasteful number, since it uses less digits than its factorization.

1321212404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415234 (or 415232 counting only the distinct ones).

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

The square root of 1321212404 is about 36348.4855805575. The cubic root of 1321212404 is about 1097.2970562704.

Adding to 1321212404 its reverse (4042121231), we get a palindrome (5363333635).

The spelling of 1321212404 in words is "one billion, three hundred twenty-one million, two hundred twelve thousand, four hundred four".