21246124253 has 8 divisors (see below), whose sum is σ = 21463810368. Its totient is φ = 21028657824.

The previous prime is 21246124243. The next prime is 21246124261. The reversal of 21246124253 is 35242164212.

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

It is a cyclic number.

It is not a de Polignac number, because 21246124253 - 2¹⁰ = 21246123229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246124243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143126 + ... + 250952.

It is an arithmetic number, because the mean of its divisors is an integer number (2682976296).

Almost surely, 2^21246124253 is an apocalyptic number.

It is an amenable number.

21246124253 is a deficient number, since it is larger than the sum of its proper divisors (217686115).

21246124253 is a wasteful number, since it uses less digits than its factorization.

21246124253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109843.

The product of its digits is 23040, while the sum is 32.

Adding to 21246124253 its reverse (35242164212), we get a palindrome (56488288465).

The spelling of 21246124253 in words is "twenty-one billion, two hundred forty-six million, one hundred twenty-four thousand, two hundred fifty-three".