21530052150 has 48 divisors (see below), whose sum is σ = 53438432400. Its totient is φ = 5736626560.

The previous prime is 21530052119. The next prime is 21530052151. The reversal of 21530052150 is 5125003512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21530052150.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530052151) 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, 125956 + ... + 242744.

It is an arithmetic number, because the mean of its divisors is an integer number (1113300675).

Almost surely, 2^21530052150 is an apocalyptic number.

21530052150 is an abundant number, since it is smaller than the sum of its proper divisors (31908380250).

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

21530052150 is a wasteful number, since it uses less digits than its factorization.

21530052150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118033 (or 118028 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 21530052150 its reverse (5125003512), we get a palindrome (26655055662).

The spelling of 21530052150 in words is "twenty-one billion, five hundred thirty million, fifty-two thousand, one hundred fifty".