21916824249 has 16 divisors (see below), whose sum is σ = 30032735040. Its totient is φ = 14208387840.

The previous prime is 21916824247. The next prime is 21916824253. The reversal of 21916824249 is 94242861912.

It is not a de Polignac number, because 21916824249 - 2¹ = 21916824247 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21916824198 and 21916824207.

It is not an unprimeable number, because it can be changed into a prime (21916824247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252444 + ... + 327965.

It is an arithmetic number, because the mean of its divisors is an integer number (1877045940).

Almost surely, 2^21916824249 is an apocalyptic number.

It is an amenable number.

21916824249 is a deficient number, since it is larger than the sum of its proper divisors (8115910791).

21916824249 is a wasteful number, since it uses less digits than its factorization.

21916824249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580760.

The product of its digits is 497664, while the sum is 48.

The spelling of 21916824249 in words is "twenty-one billion, nine hundred sixteen million, eight hundred twenty-four thousand, two hundred forty-nine".