213444423 has 16 divisors (see below), whose sum is σ = 332857600. Its totient is φ = 134806680.

The previous prime is 213444419. The next prime is 213444463. The reversal of 213444423 is 324444312.

It is a happy number.

213444423 is a `hidden beast` number, since 213 + 4 + 4 + 442 + 3 = 666.

It is not a de Polignac number, because 213444423 - 2² = 213444419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213444463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207523 + ... + 208548.

It is an arithmetic number, because the mean of its divisors is an integer number (20803600).

Almost surely, 2^213444423 is an apocalyptic number.

213444423 is a deficient number, since it is larger than the sum of its proper divisors (119413177).

213444423 is a wasteful number, since it uses less digits than its factorization.

213444423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416099 (or 416093 counting only the distinct ones).

The product of its digits is 9216, while the sum is 27.

The square root of 213444423 is about 14609.7372666315. The cubic root of 213444423 is about 597.6243310766.

Adding to 213444423 its reverse (324444312), we get a palindrome (537888735).

The spelling of 213444423 in words is "two hundred thirteen million, four hundred forty-four thousand, four hundred twenty-three".