212464661 has 4 divisors (see below), whose sum is σ = 212502732. Its totient is φ = 212426592.

The previous prime is 212464649. The next prime is 212464663. The reversal of 212464661 is 166464212.

212464661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67141636 + 145323025 = 8194^2 + 12055^2 .

It is a cyclic number.

It is not a de Polignac number, because 212464661 - 2²² = 208270357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212464663) 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, 8846 + ... + 22431.

It is an arithmetic number, because the mean of its divisors is an integer number (53125683).

Almost surely, 2^212464661 is an apocalyptic number.

It is an amenable number.

212464661 is a deficient number, since it is larger than the sum of its proper divisors (38071).

212464661 is an equidigital number, since it uses as much as digits as its factorization.

212464661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38070.

The product of its digits is 13824, while the sum is 32.

The square root of 212464661 is about 14576.1675690148. The cubic root of 212464661 is about 596.7085145200.

The spelling of 212464661 in words is "two hundred twelve million, four hundred sixty-four thousand, six hundred sixty-one".