213479021 has 4 divisors (see below), whose sum is σ = 243976032. Its totient is φ = 182982012.

The previous prime is 213478997. The next prime is 213479033. The reversal of 213479021 is 120974312.

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-213479021 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 (213473021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15248495 + ... + 15248508.

It is an arithmetic number, because the mean of its divisors is an integer number (60994008).

Almost surely, 2^213479021 is an apocalyptic number.

It is an amenable number.

213479021 is a deficient number, since it is larger than the sum of its proper divisors (30497011).

213479021 is an equidigital number, since it uses as much as digits as its factorization.

213479021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30497010.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 213479021 is about 14610.9212919651. The cubic root of 213479021 is about 597.6566197152.

The spelling of 213479021 in words is "two hundred thirteen million, four hundred seventy-nine thousand, twenty-one".