212421503530 has 64 divisors (see below), whose sum is σ = 394338930336. Its totient is φ = 82349568000.

The previous prime is 212421503513. The next prime is 212421503531. The reversal of 212421503530 is 35305124212.

It can be written as a sum of positive squares in 16 ways, for example, as 5459288769 + 206962214761 = 73887^2 + 454931^2 .

It is not an unprimeable number, because it can be changed into a prime (212421503531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65947320 + ... + 65950540.

Almost surely, 2^212421503530 is an apocalyptic number.

212421503530 is a deficient number, since it is larger than the sum of its proper divisors (181917426806).

212421503530 is a wasteful number, since it uses less digits than its factorization.

212421503530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 212421503530 its reverse (35305124212), we get a palindrome (247726627742).

The spelling of 212421503530 in words is "two hundred twelve billion, four hundred twenty-one million, five hundred three thousand, five hundred thirty".