213124405 has 8 divisors (see below), whose sum is σ = 275422392. Its totient is φ = 157384128.

The previous prime is 213124369. The next prime is 213124433. The reversal of 213124405 is 504421312.

It can be written as a sum of positive squares in 4 ways, for example, as 33108516 + 180015889 = 5754^2 + 13417^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 213124405 - 2²¹ = 211027253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639354 + ... + 1639483.

It is an arithmetic number, because the mean of its divisors is an integer number (34427799).

Almost surely, 2^213124405 is an apocalyptic number.

It is an amenable number.

213124405 is a deficient number, since it is larger than the sum of its proper divisors (62297987).

213124405 is a wasteful number, since it uses less digits than its factorization.

213124405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278855.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 213124405 is about 14598.7809422568. The cubic root of 213124405 is about 597.3255082401.

Adding to 213124405 its reverse (504421312), we get a palindrome (717545717).

The spelling of 213124405 in words is "two hundred thirteen million, one hundred twenty-four thousand, four hundred five".