212991315785284 has 27 divisors (see below), whose sum is σ = 377283980536477. Its totient is φ = 105211380950864.

The previous prime is 212991315785243. The next prime is 212991315785317. The reversal of 212991315785284 is 482587513199212.

The square root of 212991315785284 is 14594222.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 79152516432900 + 133838799352384 = 8896770^2 + 11568872^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2422596894 + ... + 2422684810.

Almost surely, 2^{212991315785284} is an apocalyptic number.

212991315785284 is the 14594222-nd square number.

It is an amenable number.

212991315785284 is a deficient number, since it is larger than the sum of its proper divisors (164292664751193).

212991315785284 is an frugal number, since it uses more digits than its factorization.

212991315785284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176004 (or 88002 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 67.

The spelling of 212991315785284 in words is "two hundred twelve trillion, nine hundred ninety-one billion, three hundred fifteen million, seven hundred eighty-five thousand, two hundred eighty-four".