212247407 has 4 divisors (see below), whose sum is σ = 212395536. Its totient is φ = 212099280.

The previous prime is 212247403. The next prime is 212247419. The reversal of 212247407 is 704742212.

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

It is a cyclic number.

It is not a de Polignac number, because 212247407 - 2² = 212247403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212247407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212247403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71894 + ... + 74787.

It is an arithmetic number, because the mean of its divisors is an integer number (53098884).

Almost surely, 2^212247407 is an apocalyptic number.

212247407 is a deficient number, since it is larger than the sum of its proper divisors (148129).

212247407 is a wasteful number, since it uses less digits than its factorization.

212247407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148128.

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 212247407 is about 14568.7132925320. The cubic root of 212247407 is about 596.5050586877.

Adding to 212247407 its reverse (704742212), we get a palindrome (916989619).

The spelling of 212247407 in words is "two hundred twelve million, two hundred forty-seven thousand, four hundred seven".