21724377520064 has 14 divisors (see below), whose sum is σ = 43109311641504. Its totient is φ = 10862188760000.

The previous prime is 21724377519961. The next prime is 21724377520073. The reversal of 21724377520064 is 46002577342712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21724377519994 and 21724377520021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169721699312 + ... + 169721699439.

Almost surely, 2^{21724377520064} is an apocalyptic number.

It is an amenable number.

21724377520064 is a deficient number, since it is larger than the sum of its proper divisors (21384934121440).

21724377520064 is an equidigital number, since it uses as much as digits as its factorization.

21724377520064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339443398763 (or 339443398753 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 50.

The spelling of 21724377520064 in words is "twenty-one trillion, seven hundred twenty-four billion, three hundred seventy-seven million, five hundred twenty thousand, sixty-four".