21530653223757 has 8 divisors (see below), whose sum is σ = 28721412718560. Its totient is φ = 14346831272400.

The previous prime is 21530653223753. The next prime is 21530653223813. The reversal of 21530653223757 is 75732235603512.

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

It is not a de Polignac number, because 21530653223757 - 2² = 21530653223753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530653223753) 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, 1734378619 + ... + 1734391032.

It is an arithmetic number, because the mean of its divisors is an integer number (3590176589820).

Almost surely, 2^{21530653223757} is an apocalyptic number.

It is an amenable number.

21530653223757 is a deficient number, since it is larger than the sum of its proper divisors (7190759494803).

21530653223757 is a wasteful number, since it uses less digits than its factorization.

21530653223757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468771723.

The product of its (nonzero) digits is 7938000, while the sum is 51.

The spelling of 21530653223757 in words is "twenty-one trillion, five hundred thirty billion, six hundred fifty-three million, two hundred twenty-three thousand, seven hundred fifty-seven".