212181712 has 10 divisors (see below), whose sum is σ = 411102098. Its totient is φ = 106090848.

The previous prime is 212181679. The next prime is 212181757. The reversal of 212181712 is 217181212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 201185856 + 10995856 = 14184^2 + 3316^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6630663 + ... + 6630694.

Almost surely, 2^212181712 is an apocalyptic number.

It is an amenable number.

212181712 is a deficient number, since it is larger than the sum of its proper divisors (198920386).

212181712 is a wasteful number, since it uses less digits than its factorization.

212181712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13261365 (or 13261359 counting only the distinct ones).

The product of its digits is 448, while the sum is 25.

The square root of 212181712 is about 14566.4584577034. The cubic root of 212181712 is about 596.4435087507.

The spelling of 212181712 in words is "two hundred twelve million, one hundred eighty-one thousand, seven hundred twelve".