21523212150 has 48 divisors (see below), whose sum is σ = 58230076608. Its totient is φ = 5217748000.

The previous prime is 21523212121. The next prime is 21523212187. The reversal of 21523212150 is 5121232512.

It is a super-2 number, since 2×21523212150² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21523212150.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6520536 + ... + 6523835.

It is an arithmetic number, because the mean of its divisors is an integer number (1213126596).

Almost surely, 2^21523212150 is an apocalyptic number.

21523212150 is an abundant number, since it is smaller than the sum of its proper divisors (36706864458).

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

21523212150 is a wasteful number, since it uses less digits than its factorization.

21523212150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13044397 (or 13044392 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21523212150 its reverse (5121232512), we get a palindrome (26644444662).

The spelling of 21523212150 in words is "twenty-one billion, five hundred twenty-three million, two hundred twelve thousand, one hundred fifty".