670213121 has 4 divisors (see below), whose sum is σ = 673017600. Its totient is φ = 667408644.

The previous prime is 670213111. The next prime is 670213133. The reversal of 670213121 is 121312076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670213121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670213111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401881 + ... + 1402358.

It is an arithmetic number, because the mean of its divisors is an integer number (168254400).

Almost surely, 2^670213121 is an apocalyptic number.

It is an amenable number.

670213121 is a deficient number, since it is larger than the sum of its proper divisors (2804479).

670213121 is a wasteful number, since it uses less digits than its factorization.

670213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804478.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 670213121 is about 25888.4746750364. The cubic root of 670213121 is about 875.1267826086.

Adding to 670213121 its reverse (121312076), we get a palindrome (791525197).

The spelling of 670213121 in words is "six hundred seventy million, two hundred thirteen thousand, one hundred twenty-one".