21602650240 has 64 divisors (see below), whose sum is σ = 51680799000. Its totient is φ = 8634875904.

The previous prime is 21602650219. The next prime is 21602650243. The reversal of 21602650240 is 4205620612.

It can be written as a sum of positive squares in 4 ways, for example, as 19597760064 + 2004890176 = 139992^2 + 44776^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21602650199 and 21602650208.

It is not an unprimeable number, because it can be changed into a prime (21602650243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941626 + ... + 964294.

Almost surely, 2^21602650240 is an apocalyptic number.

21602650240 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 21602650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25840399500).

21602650240 is an abundant number, since it is smaller than the sum of its proper divisors (30078148760).

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

21602650240 is a wasteful number, since it uses less digits than its factorization.

21602650240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24177 (or 24165 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 21602650240 in words is "twenty-one billion, six hundred two million, six hundred fifty thousand, two hundred forty".