21611765270064 has 40 divisors (see below), whose sum is σ = 55833400298752. Its totient is φ = 7203533797440.

The previous prime is 21611765270063. The next prime is 21611765270111. The reversal of 21611765270064 is 46007256711612.

21611765270064 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 21611765269995 and 21611765270022.

It is not an unprimeable number, because it can be changed into a prime (21611765270063) 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, 11222452 + ... + 13006419.

Almost surely, 2^{21611765270064} is an apocalyptic number.

21611765270064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21611765270064 is an abundant number, since it is smaller than the sum of its proper divisors (34221635028688).

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

21611765270064 is a wasteful number, since it uses less digits than its factorization.

21611765270064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24247465 (or 24247459 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 21611765270064 in words is "twenty-one trillion, six hundred eleven billion, seven hundred sixty-five million, two hundred seventy thousand, sixty-four".