1221404316 has 48 divisors (see below), whose sum is σ = 3143992320. Its totient is φ = 365960320.

The previous prime is 1221404273. The next prime is 1221404329. The reversal of 1221404316 is 6134041221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40236 + ... + 63731.

It is an arithmetic number, because the mean of its divisors is an integer number (65499840).

Almost surely, 2^1221404316 is an apocalyptic number.

It is an amenable number.

1221404316 is an abundant number, since it is smaller than the sum of its proper divisors (1922588004).

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

1221404316 is a wasteful number, since it uses less digits than its factorization.

1221404316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104074 (or 104072 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1221404316 is about 34948.5953365797. The cubic root of 1221404316 is about 1068.9395602070.

Adding to 1221404316 its reverse (6134041221), we get a palindrome (7355445537).

The spelling of 1221404316 in words is "one billion, two hundred twenty-one million, four hundred four thousand, three hundred sixteen".