213121523530 has 8 divisors (see below), whose sum is σ = 383618742372. Its totient is φ = 85248609408.

The previous prime is 213121523507. The next prime is 213121523557. The reversal of 213121523530 is 35325121312.

213121523530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 210771891801 + 2349631729 = 459099^2 + 48473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10656076167 + ... + 10656076186.

Almost surely, 2^213121523530 is an apocalyptic number.

213121523530 is a deficient number, since it is larger than the sum of its proper divisors (170497218842).

213121523530 is a wasteful number, since it uses less digits than its factorization.

213121523530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21312152360.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 213121523530 its reverse (35325121312), we get a palindrome (248446644842).

The spelling of 213121523530 in words is "two hundred thirteen billion, one hundred twenty-one million, five hundred twenty-three thousand, five hundred thirty".