212320018 has 4 divisors (see below), whose sum is σ = 318480030. Its totient is φ = 106160008.

The previous prime is 212320007. The next prime is 212320019. The reversal of 212320018 is 810023212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 172213129 + 40106889 = 13123^2 + 6333^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212319977 and 212320004.

It is not an unprimeable number, because it can be changed into a prime (212320019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53080003 + ... + 53080006.

Almost surely, 2^212320018 is an apocalyptic number.

212320018 is a deficient number, since it is larger than the sum of its proper divisors (106160012).

212320018 is a wasteful number, since it uses less digits than its factorization.

212320018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106160011.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 212320018 is about 14571.2050977261. The cubic root of 212320018 is about 596.5730734811.

The spelling of 212320018 in words is "two hundred twelve million, three hundred twenty thousand, eighteen".