21597504213 has 8 divisors (see below), whose sum is σ = 28859686528. Its totient is φ = 14366829024.

The previous prime is 21597504211. The next prime is 21597504217. The reversal of 21597504213 is 31240579512.

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

It is not a de Polignac number, because 21597504213 - 2¹ = 21597504211 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 (21597504211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7875181 + ... + 7877922.

It is an arithmetic number, because the mean of its divisors is an integer number (3607460816).

Almost surely, 2^21597504213 is an apocalyptic number.

It is an amenable number.

21597504213 is a deficient number, since it is larger than the sum of its proper divisors (7262182315).

21597504213 is a wasteful number, since it uses less digits than its factorization.

21597504213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15753563.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 21597504213 in words is "twenty-one billion, five hundred ninety-seven million, five hundred four thousand, two hundred thirteen".