21124150252 has 6 divisors (see below), whose sum is σ = 36967262948. Its totient is φ = 10562075124.

The previous prime is 21124150193. The next prime is 21124150259. The reversal of 21124150252 is 25205142112.

It is not an unprimeable number, because it can be changed into a prime (21124150259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640518778 + ... + 2640518785.

Almost surely, 2^21124150252 is an apocalyptic number.

It is an amenable number.

21124150252 is a deficient number, since it is larger than the sum of its proper divisors (15843112696).

21124150252 is a wasteful number, since it uses less digits than its factorization.

21124150252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281037567 (or 5281037565 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21124150252 its reverse (25205142112), we get a palindrome (46329292364).

The spelling of 21124150252 in words is "twenty-one billion, one hundred twenty-four million, one hundred fifty thousand, two hundred fifty-two".