316221012 has 36 divisors (see below), whose sum is σ = 846357876. Its totient is φ = 99206400.

The previous prime is 316220977. The next prime is 316221019. The reversal of 316221012 is 210122613.

316221012 is a `hidden beast` number, since 31 + 622 + 1 + 0 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 279424656 + 36796356 = 16716^2 + 6066^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316221019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257739 + ... + 258962.

It is an arithmetic number, because the mean of its divisors is an integer number (23509941).

Almost surely, 2^316221012 is an apocalyptic number.

It is an amenable number.

316221012 is an abundant number, since it is smaller than the sum of its proper divisors (530136864).

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

316221012 is a wasteful number, since it uses less digits than its factorization.

316221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516728 (or 516723 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 316221012 is about 17782.6041962363. The cubic root of 316221012 is about 681.2872186607.

Adding to 316221012 its reverse (210122613), we get a palindrome (526343625).

The spelling of 316221012 in words is "three hundred sixteen million, two hundred twenty-one thousand, twelve".