213242425 has 24 divisors (see below), whose sum is σ = 289168992. Its totient is φ = 154704000.

The previous prime is 213242401. The next prime is 213242429. The reversal of 213242425 is 524242312.

It is not a de Polignac number, because 213242425 - 2⁹ = 213241913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213242425.

It is not an unprimeable number, because it can be changed into a prime (213242429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160765 + ... + 162085.

It is an arithmetic number, because the mean of its divisors is an integer number (12048708).

Almost surely, 2^213242425 is an apocalyptic number.

213242425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213242425 is a deficient number, since it is larger than the sum of its proper divisors (75926567).

213242425 is a wasteful number, since it uses less digits than its factorization.

213242425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929 (or 1924 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 213242425 is about 14602.8225011468. The cubic root of 213242425 is about 597.4357464329.

Adding to 213242425 its reverse (524242312), we get a palindrome (737484737).

The spelling of 213242425 in words is "two hundred thirteen million, two hundred forty-two thousand, four hundred twenty-five".