212778996774912 has 1344 divisors, whose sum is σ = 679128398807040. Its totient is φ = 66482049908736.

The previous prime is 212778996774863. The next prime is 212778996774931. The reversal of 212778996774912 is 219477699877212.

212778996774912 is a `hidden beast` number, since 21 + 27 + 7 + 89 + 9 + 6 + 7 + 7 + 491 + 2 = 666.

It is a super-2 number, since 2×212778996774912² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 423019874053 + ... + 423019874555.

It is an arithmetic number, because the mean of its divisors is an integer number (505303868160).

Almost surely, 2^{212778996774912} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212778996774912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339564199403520).

212778996774912 is an abundant number, since it is smaller than the sum of its proper divisors (466349402032128).

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

212778996774912 is an equidigital number, since it uses as much as digits as its factorization.

212778996774912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 755 counting only the distinct ones).

The product of its digits is 2688505344, while the sum is 81.

The spelling of 212778996774912 in words is "two hundred twelve trillion, seven hundred seventy-eight billion, nine hundred ninety-six million, seven hundred seventy-four thousand, nine hundred twelve".