21124102250 has 64 divisors (see below), whose sum is σ = 42302935584. Its totient is φ = 7870464000.

The previous prime is 21124102217. The next prime is 21124102253. The reversal of 21124102250 is 5220142112.

It can be written as a sum of positive squares in 16 ways, for example, as 387814249 + 20736288001 = 19693^2 + 144001^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21124102253) 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, 386630 + ... + 437870.

Almost surely, 2^21124102250 is an apocalyptic number.

21124102250 is an abundant number, since it is smaller than the sum of its proper divisors (21178833334).

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

21124102250 is a wasteful number, since it uses less digits than its factorization.

21124102250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51372 (or 51362 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21124102250 its reverse (5220142112), we get a palindrome (26344244362).

The spelling of 21124102250 in words is "twenty-one billion, one hundred twenty-four million, one hundred two thousand, two hundred fifty".