21124102245 has 16 divisors (see below), whose sum is σ = 35577435840. Its totient is φ = 10673230464.

The previous prime is 21124102217. The next prime is 21124102253. The reversal of 21124102245 is 54220142112.

It is not a de Polignac number, because 21124102245 - 2⁷ = 21124102117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37059544 + ... + 37060113.

It is an arithmetic number, because the mean of its divisors is an integer number (2223589740).

Almost surely, 2^21124102245 is an apocalyptic number.

It is an amenable number.

21124102245 is a deficient number, since it is larger than the sum of its proper divisors (14453333595).

21124102245 is a wasteful number, since it uses less digits than its factorization.

21124102245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74119684.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21124102245 its reverse (54220142112), we get a palindrome (75344244357).

The spelling of 21124102245 in words is "twenty-one billion, one hundred twenty-four million, one hundred two thousand, two hundred forty-five".