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213110421 = 3233304879

213110421 has 8 divisors (see below), whose sum is σ = 285367680. Its totient is φ = 141463392.

The previous prime is 213110389. The next prime is 213110437. The reversal of 213110421 is 124011312.

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

It is not a de Polignac number, because 213110421 - 25 = 213110389 is a prime.

It is a super-3 number, since 3×2131104213 (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213110421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213110921) 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, 151741 + ... + 153138.

It is an arithmetic number, because the mean of its divisors is an integer number (35670960).

Almost surely, 2213110421 is an apocalyptic number.

It is an amenable number.

213110421 is a deficient number, since it is larger than the sum of its proper divisors (72257259).

213110421 is a wasteful number, since it uses less digits than its factorization.

213110421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305115.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 213110421 is about 14598.3019903001. The cubic root of 213110421 is about 597.3124435974.

Adding to 213110421 its reverse (124011312), we get a palindrome (337121733).

It can be divided in two parts, 213110 and 421, that added together give a triangular number (213531 = T653).

The spelling of 213110421 in words is "two hundred thirteen million, one hundred ten thousand, four hundred twenty-one".

Divisors: 1 3 233 699 304879 914637 71036807 213110421