213660851 has 4 divisors (see below), whose sum is σ = 218629752. Its totient is φ = 208691952.

The previous prime is 213660847. The next prime is 213660901. The reversal of 213660851 is 158066312.

It is a happy number.

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 213660851 - 2² = 213660847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213660151) 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, 2484386 + ... + 2484471.

It is an arithmetic number, because the mean of its divisors is an integer number (54657438).

Almost surely, 2^213660851 is an apocalyptic number.

213660851 is a deficient number, since it is larger than the sum of its proper divisors (4968901).

213660851 is an equidigital number, since it uses as much as digits as its factorization.

213660851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4968900.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 213660851 is about 14617.1423677817. The cubic root of 213660851 is about 597.8262555317.

The spelling of 213660851 in words is "two hundred thirteen million, six hundred sixty thousand, eight hundred fifty-one".