212504137 has 4 divisors (see below), whose sum is σ = 212659396. Its totient is φ = 212348880.

The previous prime is 212504081. The next prime is 212504177. The reversal of 212504137 is 731405212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90269001 + 122235136 = 9501^2 + 11056^2 .

It is a cyclic number.

It is not a de Polignac number, because 212504137 - 2⁷ = 212504009 is a prime.

It is a super-2 number, since 2×212504137² = 90316016484229538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212504177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75558 + ... + 78319.

It is an arithmetic number, because the mean of its divisors is an integer number (53164849).

Almost surely, 2^212504137 is an apocalyptic number.

It is an amenable number.

212504137 is a deficient number, since it is larger than the sum of its proper divisors (155259).

212504137 is a wasteful number, since it uses less digits than its factorization.

212504137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155258.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 212504137 is about 14577.5216343520. The cubic root of 212504137 is about 596.7454684405.

Adding to 212504137 its reverse (731405212), we get a palindrome (943909349).

The spelling of 212504137 in words is "two hundred twelve million, five hundred four thousand, one hundred thirty-seven".