21452819661758 has 8 divisors (see below), whose sum is σ = 32280741258552. Its totient is φ = 10692572575576.

The previous prime is 21452819661751. The next prime is 21452819661811. The reversal of 21452819661758 is 85716691825412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21452819661694 and 21452819661703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452819661751) 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, 16918626860 + ... + 16918628127.

It is an arithmetic number, because the mean of its divisors is an integer number (4035092657319).

Almost surely, 2^{21452819661758} is an apocalyptic number.

21452819661758 is a deficient number, since it is larger than the sum of its proper divisors (10827921596794).

21452819661758 is a wasteful number, since it uses less digits than its factorization.

21452819661758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33837255306.

The product of its digits is 58060800, while the sum is 65.

The spelling of 21452819661758 in words is "twenty-one trillion, four hundred fifty-two billion, eight hundred nineteen million, six hundred sixty-one thousand, seven hundred fifty-eight".