21770448487660 has 96 divisors (see below), whose sum is σ = 47967893987328. Its totient is φ = 8289217347840.

The previous prime is 21770448487649. The next prime is 21770448487673. The reversal of 21770448487660 is 6678484407712.

It is a junction number, because it is equal to n+sod(n) for n = 21770448487592 and 21770448487601.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27735517 + ... + 28509643.

It is an arithmetic number, because the mean of its divisors is an integer number (499665562368).

Almost surely, 2^{21770448487660} is an apocalyptic number.

21770448487660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21770448487660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23983946993664).

21770448487660 is an abundant number, since it is smaller than the sum of its proper divisors (26197445499668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21770448487660 is a wasteful number, since it uses less digits than its factorization.

21770448487660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774911 (or 774909 counting only the distinct ones).

The product of its (nonzero) digits is 101154816, while the sum is 64.

The spelling of 21770448487660 in words is "twenty-one trillion, seven hundred seventy billion, four hundred forty-eight million, four hundred eighty-seven thousand, six hundred sixty".