212742530 has 128 divisors (see below), whose sum is σ = 525159936. Its totient is φ = 59904000.

The previous prime is 212742527. The next prime is 212742533. The reversal of 212742530 is 35247212.

It is an interprime number because it is at equal distance from previous prime (212742527) and next prime (212742533).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 212742530.

It is not an unprimeable number, because it can be changed into a prime (212742533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 530330 + ... + 530730.

It is an arithmetic number, because the mean of its divisors is an integer number (4102812).

Almost surely, 2^212742530 is an apocalyptic number.

212742530 is an abundant number, since it is smaller than the sum of its proper divisors (312417406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212742530 is a wasteful number, since it uses less digits than its factorization.

212742530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 212742530 is about 14585.6960752650. The cubic root of 212742530 is about 596.9685335543.

Adding to 212742530 its reverse (35247212), we get a palindrome (247989742).

The spelling of 212742530 in words is "two hundred twelve million, seven hundred forty-two thousand, five hundred thirty".