21261242500597 has 8 divisors (see below), whose sum is σ = 23587202774880. Its totient is φ = 19000802234160.

The previous prime is 21261242500577. The next prime is 21261242500601. The reversal of 21261242500597 is 79500524216212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21261242500597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261242500577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16380001278 + ... + 16380002575.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400346860).

Almost surely, 2^{21261242500597} is an apocalyptic number.

It is an amenable number.

21261242500597 is a deficient number, since it is larger than the sum of its proper divisors (2325960274283).

21261242500597 is a wasteful number, since it uses less digits than its factorization.

21261242500597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32760003923.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 21261242500597 in words is "twenty-one trillion, two hundred sixty-one billion, two hundred forty-two million, five hundred thousand, five hundred ninety-seven".