1216971284 has 12 divisors (see below), whose sum is σ = 2129982624. Its totient is φ = 608404824.

The previous prime is 1216971281. The next prime is 1216971293. The reversal of 1216971284 is 4821796121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216971281) 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, 24827 + ... + 55229.

It is an arithmetic number, because the mean of its divisors is an integer number (177498552).

Almost surely, 2^1216971284 is an apocalyptic number.

It is an amenable number.

1216971284 is a deficient number, since it is larger than the sum of its proper divisors (913011340).

1216971284 is a wasteful number, since it uses less digits than its factorization.

1216971284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40414 (or 40412 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 1216971284 is about 34885.1155079068. The cubic root of 1216971284 is about 1067.6447698035.

The spelling of 1216971284 in words is "one billion, two hundred sixteen million, nine hundred seventy-one thousand, two hundred eighty-four".