212473661 has 8 divisors (see below), whose sum is σ = 216753624. Its totient is φ = 208203840.

The previous prime is 212473631. The next prime is 212473663. The reversal of 212473661 is 166374212.

It can be written as a sum of positive squares in 4 ways, for example, as 38365636 + 174108025 = 6194^2 + 13195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212473661 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 (212473663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50831 + ... + 54851.

It is an arithmetic number, because the mean of its divisors is an integer number (27094203).

Almost surely, 2^212473661 is an apocalyptic number.

It is an amenable number.

212473661 is a deficient number, since it is larger than the sum of its proper divisors (4279963).

212473661 is an equidigital number, since it uses as much as digits as its factorization.

212473661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071.

The product of its digits is 12096, while the sum is 32.

The square root of 212473661 is about 14576.4762888704. The cubic root of 212473661 is about 596.7169399224.

The spelling of 212473661 in words is "two hundred twelve million, four hundred seventy-three thousand, six hundred sixty-one".