21224410597 has 16 divisors (see below), whose sum is σ = 24335346672. Its totient is φ = 18337397760.

The previous prime is 21224410499. The next prime is 21224410601. The reversal of 21224410597 is 79501442212.

It is a Cunningham number, because it is equal to 145686²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 4700336481 + 16524074116 = 68559^2 + 128546^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224410597 - 2¹¹ = 21224408549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224410897) 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, 225298 + ... + 305299.

It is an arithmetic number, because the mean of its divisors is an integer number (1520959167).

Almost surely, 2^21224410597 is an apocalyptic number.

It is an amenable number.

21224410597 is a deficient number, since it is larger than the sum of its proper divisors (3110936075).

21224410597 is a wasteful number, since it uses less digits than its factorization.

21224410597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530808.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21224410597 in words is "twenty-one billion, two hundred twenty-four million, four hundred ten thousand, five hundred ninety-seven".