21453148646078 has 8 divisors (see below), whose sum is σ = 32179743540072. Its totient is φ = 10726567466056.

The previous prime is 21453148645997. The next prime is 21453148646081. The reversal of 21453148646078 is 87064684135412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2608001 + ... + 7050387.

It is an arithmetic number, because the mean of its divisors is an integer number (4022467942509).

Almost surely, 2^{21453148646078} is an apocalyptic number.

21453148646078 is a deficient number, since it is larger than the sum of its proper divisors (10726594893994).

21453148646078 is a wasteful number, since it uses less digits than its factorization.

21453148646078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856986.

The product of its (nonzero) digits is 30965760, while the sum is 59.

The spelling of 21453148646078 in words is "twenty-one trillion, four hundred fifty-three billion, one hundred forty-eight million, six hundred forty-six thousand, seventy-eight".