21124102249 has 4 divisors (see below), whose sum is σ = 21124451920. Its totient is φ = 21123752580.

The previous prime is 21124102217. The next prime is 21124102253. The reversal of 21124102249 is 94220142112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21124102249 - 2⁵ = 21124102217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124102949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58347 + ... + 213664.

It is an arithmetic number, because the mean of its divisors is an integer number (5281112980).

Almost surely, 2^21124102249 is an apocalyptic number.

It is an amenable number.

21124102249 is a deficient number, since it is larger than the sum of its proper divisors (349671).

21124102249 is an equidigital number, since it uses as much as digits as its factorization.

21124102249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349670.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21124102249 in words is "twenty-one billion, one hundred twenty-four million, one hundred two thousand, two hundred forty-nine".