24240221821 has 4 divisors (see below), whose sum is σ = 24260141052. Its totient is φ = 24220302592.

The previous prime is 24240221711. The next prime is 24240221833. The reversal of 24240221821 is 12812204242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17762225625 + 6477996196 = 133275^2 + 80486^2 .

It is a cyclic number.

It is not a de Polignac number, because 24240221821 - 2¹⁵ = 24240189053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 24240221821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24240221221) 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, 9957790 + ... + 9960223.

It is an arithmetic number, because the mean of its divisors is an integer number (6065035263).

Almost surely, 2^24240221821 is an apocalyptic number.

It is an amenable number.

24240221821 is a deficient number, since it is larger than the sum of its proper divisors (19919231).

24240221821 is a wasteful number, since it uses less digits than its factorization.

24240221821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19919230.

The product of its (nonzero) digits is 4096, while the sum is 28.

The spelling of 24240221821 in words is "twenty-four billion, two hundred forty million, two hundred twenty-one thousand, eight hundred twenty-one".